diff --git a/y2015/src/days/d22.rs b/y2015/src/days/d22.rs
index d5b904c..f0c7a19 100644
--- a/y2015/src/days/d22.rs
+++ b/y2015/src/days/d22.rs
@@ -1,3 +1,5 @@
+use core::panic;
+
 pub fn process_part1(input: &str) -> u32 {
     let mut boss = Character::default();
     input.lines().for_each(|line| {
@@ -13,15 +15,62 @@ pub fn process_part1(input: &str) -> u32 {
         mana: 500,
         ..Default::default()
     };
-    let mut used_mana = Vec::new();
-    for spell in Spell::get_all() {
-        used_mana.push(round(player.clone(), boss.clone(), spell, 0));
-    }
+    // Initial state, nothing happened yet
+    let start = RoundNode {
+        player,
+        boss,
+        spent_mana: 0,
+        state: State::Playing,
+    };
     let mut smallest = u32::MAX;
-    for state in used_mana {
-        if state.get_value() < smallest {
-            smallest = state.get_value();
+    let mut leafs = vec![start];
+    let mut test = 0;
+    println!("start");
+    loop {
+        println!("iter: {test},");
+        let current_leafs = leafs.clone();
+        println!("leaf count: {}", current_leafs.len());
+        leafs.clear();
+        // create potential rounds
+        for leaf in current_leafs {
+            if leaf.state == State::Playing {
+                //println!("try for leaf");
+                for spell in Spell::get_all() {
+                    leafs.push(leaf.use_spell(spell));
+                }
+            }
         }
+        for leaf in &leafs {
+            if leaf.state == State::Win && leaf.spent_mana < smallest {
+                smallest = leaf.spent_mana;
+            }
+            //println!(
+            //    "player hp: {}, boss hp: {}, spent mana so far: {}",
+            //    leaf.player.hp, leaf.boss.hp, leaf.spent_mana
+            //);
+        }
+        leafs = leafs
+            .clone()
+            .iter()
+            .filter(|&leaf| leaf.state == State::Playing || leaf.spent_mana <= smallest)
+            .map(|leaf| leaf.to_owned())
+            .collect();
+        if leafs.is_empty() {
+            break;
+        }
+        // already know it's higher than this
+        if smallest <= 2000 {
+            let mut count_losses = 0;
+            for leaf in leafs {
+                if leaf.state == State::Loss {
+                    count_losses += 1;
+                }
+            }
+            println!("Losses: {count_losses}");
+            break;
+        }
+        test += 1;
+        println!(" smallest: {smallest}");
     }
     smallest
 }
@@ -30,139 +79,179 @@ pub fn process_part2(input: &str) -> u32 {
     0
 }
 
-fn round(mut player: Character, mut boss: Character, spell: Spell, spent_so_far: u32) -> State {
-    // Player turn
-    for effect in player.status_effects.iter_mut() {
-        if effect.name == SpellID::Recharge {
-            player.mana += effect.mana;
-        }
-        effect.duration -= 1;
-        if effect.duration > 0 && effect.name == SpellID::Shield {
-            player.armor = effect.armor;
-        } else if effect.name == SpellID::Shield {
-            player.armor = 0;
-        }
-    }
-    for effect in boss.status_effects.iter_mut() {
-        boss.hp = boss.hp.saturating_sub(effect.damage);
-        effect.duration -= 1;
-    }
-    boss.status_effects = boss
-        .status_effects
-        .into_iter()
-        .filter(|&effect| effect.duration > 0)
-        .collect::<Vec<Spell>>();
-    player.status_effects = player
-        .status_effects
-        .into_iter()
-        .filter(|&effect| effect.duration > 0)
-        .collect::<Vec<Spell>>();
-    let used_mana = spell.cost + spent_so_far;
-    let mut dmg = 0;
-    match spell.name {
-        SpellID::MagicMissile => {
-            player.mana = player.mana.saturating_sub(spell.cost);
-            dmg = spell.damage;
-        }
-        SpellID::Drain => {
-            player.mana = player.mana.saturating_sub(spell.cost);
-            dmg = spell.damage;
-            player.hp += spell.hp;
-        }
-        SpellID::Shield => {
-            player.mana = player.mana.saturating_sub(spell.cost);
-            player.status_effects.push(spell);
-            player.armor = spell.armor;
-        }
-        SpellID::Poison => {
-            player.mana = player.mana.saturating_sub(spell.cost);
-            boss.status_effects.push(spell);
-        }
-        SpellID::Recharge => {
-            player.mana = player.mana.saturating_sub(spell.cost);
-            player.status_effects.push(spell);
-        }
-    }
-    boss.hp = boss.hp.saturating_sub(dmg);
-    if boss.hp == 0 {
-        return State::Win(used_mana);
-    }
-    if player.mana == 0 {
-        return State::Loss(0);
-    }
-
-    // Boss turn
-    for effect in player.status_effects.iter_mut() {
-        if effect.name == SpellID::Recharge {
-            player.mana += effect.mana;
-        }
-        effect.duration -= 1;
-        if effect.duration > 0 && effect.name == SpellID::Shield {
-            player.armor = effect.armor;
-        } else if effect.name == SpellID::Shield {
-            player.armor = 0;
-        }
-    }
-    player.status_effects = player
-        .status_effects
-        .into_iter()
-        .filter(|&effect| effect.duration > 0)
-        .collect::<Vec<Spell>>();
-    for effect in boss.status_effects.iter_mut() {
-        boss.hp = boss.hp.saturating_sub(effect.damage);
-        effect.duration -= 1;
-    }
-    if boss.hp == 0 {
-        return State::Win(used_mana);
-    }
-    boss.status_effects = boss
-        .status_effects
-        .into_iter()
-        .filter(|&effect| effect.duration > 0)
-        .collect::<Vec<Spell>>();
-    let dmg = boss.hit_damage(&player);
-    player.hp = player.hp.saturating_sub(dmg);
-
-    if player.hp == 0 {
-        return State::Loss(0);
-    }
-
-    // next round
-    let mut smallest_used_mana = State::Playing(u32::MAX);
-    for spell in Spell::get_all() {
-        let next_state = round(player.clone(), boss.clone(), spell, used_mana);
-        match next_state {
-            State::Playing(mana) => {
-                if mana < smallest_used_mana.get_value() {
-                    smallest_used_mana = State::Playing(mana);
-                }
-            }
-            State::Win(mana) => {
-                if mana < smallest_used_mana.get_value() {
-                    smallest_used_mana = State::Win(mana);
-                }
-            }
-            State::Loss(_) => {}
-        };
-    }
-    smallest_used_mana
-}
-
-#[derive(Debug)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 enum State {
-    Playing(u32),
-    Win(u32),
-    Loss(u32),
+    Playing,
+    Win,
+    Loss,
 }
 
-impl State {
-    fn get_value(&self) -> u32 {
-        match self {
-            State::Playing(value) => *value,
-            State::Win(value) => *value,
-            State::Loss(value) => *value,
+#[derive(Debug, Clone)]
+struct RoundNode {
+    player: Character,
+    boss: Character,
+    spent_mana: u32,
+    state: State,
+}
+
+impl RoundNode {
+    fn use_spell(&self, spell: Spell) -> RoundNode {
+        if self.state != State::Playing {
+            eprintln!("State: {:#?}", self.state);
+            eprintln!("spell: {spell:#?}");
+            panic!("State should be Playing");
+        }
+        let mut player = self.player.clone();
+        let mut boss = self.boss.clone();
+        // Player turn
+        for effect in player.status_effects.iter_mut() {
+            if effect.name == SpellID::Recharge {
+                player.mana += effect.mana;
+            }
+            effect.duration -= 1;
+            if effect.duration > 0 && effect.name == SpellID::Shield {
+                player.armor = effect.armor;
+            } else if effect.name == SpellID::Shield {
+                player.armor = 0;
+            }
+        }
+        for effect in boss.status_effects.iter_mut() {
+            boss.hp = boss.hp.saturating_sub(effect.damage);
+            effect.duration -= 1;
+        }
+        boss.status_effects = boss
+            .status_effects
+            .into_iter()
+            .filter(|&effect| effect.duration > 0)
+            .collect::<Vec<Spell>>();
+        if boss.hp == 0 {
+            return RoundNode {
+                player,
+                boss,
+                spent_mana: self.spent_mana,
+                state: State::Win,
+            };
+        }
+        player.status_effects = player
+            .status_effects
+            .into_iter()
+            .filter(|&effect| effect.duration > 0)
+            .collect::<Vec<Spell>>();
+        let used_mana = spell.cost;
+        let mut dmg = 0;
+        match spell.name {
+            SpellID::MagicMissile => {
+                player.mana = player.mana.saturating_sub(spell.cost);
+                dmg = spell.damage;
+            }
+            SpellID::Drain => {
+                player.mana = player.mana.saturating_sub(spell.cost);
+                dmg = spell.damage;
+                player.hp += spell.hp;
+            }
+            SpellID::Shield => {
+                player.mana = player.mana.saturating_sub(spell.cost);
+                player.status_effects.push(spell);
+                player.armor = spell.armor;
+            }
+            SpellID::Poison => {
+                player.mana = player.mana.saturating_sub(spell.cost);
+                boss.status_effects.push(spell);
+            }
+            SpellID::Recharge => {
+                player.mana = player.mana.saturating_sub(spell.cost);
+                player.status_effects.push(spell);
+            }
+        }
+        boss.hp = boss.hp.saturating_sub(dmg);
+        if boss.hp == 0 {
+            return RoundNode {
+                player,
+                boss,
+                spent_mana: used_mana + self.spent_mana,
+                state: State::Win,
+            };
+        }
+        if player.mana == 0 {
+            return RoundNode {
+                player,
+                boss,
+                spent_mana: used_mana + self.spent_mana,
+                state: State::Loss,
+            };
+        }
+
+        // Boss turn
+        for effect in player.status_effects.iter_mut() {
+            if effect.name == SpellID::Recharge {
+                player.mana += effect.mana;
+            }
+            effect.duration -= 1;
+            if effect.duration > 0 && effect.name == SpellID::Shield {
+                player.armor = effect.armor;
+            } else if effect.name == SpellID::Shield {
+                player.armor = 0;
+            }
+        }
+        player.status_effects = player
+            .status_effects
+            .into_iter()
+            .filter(|&effect| effect.duration > 0)
+            .collect::<Vec<Spell>>();
+        for effect in boss.status_effects.iter_mut() {
+            boss.hp = boss.hp.saturating_sub(effect.damage);
+            effect.duration -= 1;
+        }
+        if boss.hp == 0 {
+            return RoundNode {
+                player,
+                boss,
+                spent_mana: used_mana + self.spent_mana,
+                state: State::Win,
+            };
+        }
+        boss.status_effects = boss
+            .status_effects
+            .into_iter()
+            .filter(|&effect| effect.duration > 0)
+            .collect::<Vec<Spell>>();
+        let dmg = boss.hit_damage(&player);
+        player.hp = player.hp.saturating_sub(dmg);
+
+        if player.hp == 0 {
+            return RoundNode {
+                player,
+                boss,
+                spent_mana: used_mana + self.spent_mana,
+                state: State::Loss,
+            };
+        }
+        RoundNode {
+            player,
+            boss,
+            spent_mana: used_mana + self.spent_mana,
+            state: State::Playing,
         }
     }
+
+    //fn get_leafs(&self) -> Vec<RoundNode> {
+    //    let mut leafs = Vec::new();
+    //    match self.state {
+    //        State::Playing => {
+    //            if self.next_rounds.is_empty() {
+    //                return vec![self.clone()];
+    //            }
+    //            let mut round_leafs = Vec::new();
+    //            for round in self.next_rounds.clone() {
+    //                round_leafs = round.get_leafs();
+    //            }
+    //            leafs.append(&mut round_leafs);
+    //            leafs
+    //        }
+    //        State::Win => vec![self.clone()],
+    //        State::Loss => vec![self.clone()],
+    //    }
+    //}
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -273,17 +362,49 @@ mod tests {
             mana: 250,
             ..Default::default()
         };
-        let mut used_mana = Vec::new();
-        for spell in Spell::get_all() {
-            used_mana.push(round(player.clone(), boss.clone(), spell, 0));
-        }
-        let mut result = u32::MAX;
-        for state in used_mana {
-            if state.get_value() < result {
-                result = state.get_value();
+        // Initial state, nothing happened yet
+        let start = RoundNode {
+            player,
+            boss,
+            spent_mana: 0,
+            state: State::Playing,
+        };
+        let mut smallest = u32::MAX;
+        let mut leafs = vec![start];
+        let mut test = 0;
+        println!("start");
+        loop {
+            println!("iter: {test},");
+            let current_leafs = leafs.clone();
+            leafs.clear();
+            // create potential rounds
+            for leaf in current_leafs {
+                if leaf.state == State::Playing {
+                    for spell in Spell::get_all() {
+                        leafs.push(leaf.use_spell(spell));
+                    }
+                }
             }
+            let mut all_done = true;
+            for leaf in &leafs {
+                if leaf.state == State::Win && leaf.spent_mana < smallest {
+                    smallest = leaf.spent_mana;
+                }
+                if leaf.state == State::Playing {
+                    all_done = false;
+                }
+                println!(
+                    "player hp: {}, boss hp: {}, spent mana so far: {}",
+                    leaf.player.hp, leaf.boss.hp, leaf.spent_mana
+                );
+            }
+            if all_done {
+                break;
+            }
+            test += 1;
+            println!(" smallest: {smallest}");
         }
-        assert_eq!(result, 226);
+        assert_eq!(smallest, 226);
     }
 
     #[test]
@@ -298,17 +419,49 @@ mod tests {
             mana: 250,
             ..Default::default()
         };
-        let mut used_mana = Vec::new();
-        for spell in Spell::get_all() {
-            used_mana.push(round(player.clone(), boss.clone(), spell, 0));
-        }
-        let mut result = u32::MAX;
-        for state in used_mana {
-            if state.get_value() < result {
-                result = state.get_value();
+        // Initial state, nothing happened yet
+        let start = RoundNode {
+            player,
+            boss,
+            spent_mana: 0,
+            state: State::Playing,
+        };
+        let mut smallest = u32::MAX;
+        let mut leafs = vec![start];
+        let mut test = 0;
+        println!("start");
+        loop {
+            println!("iter: {test},");
+            let current_leafs = leafs.clone();
+            leafs.clear();
+            // create potential rounds
+            for leaf in current_leafs {
+                if leaf.state == State::Playing {
+                    for spell in Spell::get_all() {
+                        leafs.push(leaf.use_spell(spell));
+                    }
+                }
             }
+            let mut all_done = true;
+            for leaf in &leafs {
+                if leaf.state == State::Win && leaf.spent_mana < smallest {
+                    smallest = leaf.spent_mana;
+                }
+                if leaf.state == State::Playing {
+                    all_done = false;
+                }
+                println!(
+                    "player hp: {}, boss hp: {}, spent mana so far: {}",
+                    leaf.player.hp, leaf.boss.hp, leaf.spent_mana
+                );
+            }
+            if all_done {
+                break;
+            }
+            test += 1;
+            println!(" smallest: {smallest}");
         }
-        assert_eq!(result, 641);
+        assert_eq!(smallest, 641);
     }
 
     #[test]