A platformer where you're the level, and the heroes are the problem.
Tap a placed trap to upgrade or sell it. Each upgrade costs double the last one and adds 50% power, up to level 5; selling returns half of everything you spent on it. Each column can hold only one crusher and one arrow slit. Rogues hop over spikes, springs and trapdoors; knights are slow but tough. Winged heroes ignore floor traps, so hit them with flame jets, arrow slits and crushers. Mages blink three tiles ahead when they sense a trap, so layer your traps deep. On a phone, turn it sideways for a bigger board. Keys: 1–6 pick traps, U upgrades the selected trap, Space releases the wave.