Their Zelda team has been solid. It looks like the core will be around duping objects and enemies, but I imagine we’ll get some other magic items to play with. Link uses a lot more than his sword in every game, so a Zelda using only Garry’s Mod would be out of character for the series.

Still, even if literally every challenge is tied to it, there is a lot you can do, from summoning items to attack/block with, minions, things to ride on (the blade trap), special items for specific puzzles… As long as there’s easy ways to use your favorites, it could certainly carry the game.