Climb Bennett Foddy's mountain while Terraria's monsters swarm you.
Getting Over Terraria welds Terraria's bestiary onto Bennett Foddy's mountain.
You still climb the mountain with the pot and hammer. But now Terraria wakes up around you:
The monsters and their sounds are read from the real Terraria you already own and used at runtime, so the mashup ships no copyrighted Terraria content. Everything installs in one click: the loader and the mod are placed for you, and the game launches straight into the mountain.
Climb high. Smash everything.