Get it on itch.io.
One purchase on itch.io gets you the whole game. Sign in with itch.io here and the same purchase opens online play with up to 8 friends, the community maps and the map maker.
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TRAP TAPFINAL HAUNTFull Game
The 100-stage campaign with 10 bosses and 25 secrets, Hardcore, Speedrun, New Game+ and Rage Trials — plus online play with up to 8 friends in four modes, and MAP MAKER to build your own maps and play everyone else's.