Sniper Shot (Z) — buy it in the shop for 14 XP. Once unlocked, aim with your mouse and press Z to fire a laser that pierces through the first enemy in that direction for 4x your ATK. One bullet, 6 second reload. A crosshair appears when it's ready.

Walls — every non-boss floor now has a different wall layout (pillars, corridors, L-shapes, box rooms, cross shapes etc.). Enemies without wall-ignoring AI will lose sight of you if you break line of sight and stop chasing.

Bomb Throwers — show up from floor 10 onwards. They fully ignore walls and always know where you are. Bombs travel toward your position and explode in a big radius.

New enemies: Big Slime (tanky slow), Archer Skeleton (ranged), Vampire (fast + shoots), Lich (shoots 3-way spread, appears floor 23+)

Expanded shop (12 cards): +5 ATK, +10 ATK, +4 DEF, +20 Max HP, Heal 40%, +20 Range, +1 Speed, Barrier (30 HP shield), Sniper Shot, Dash, Poison Blade, Vamp Bite

XP is tighter — enemies drop less, floor bonuses are smaller. You actually have to choose between upgrades now.