Ruffy and the Riverside is a game where the player character uses an ability called SWAP to change the environment. This power allows the player to directly copy and apply textures, which changes the properties of objects and surfaces. The gamer can turn ice into lava, transform waterfalls into vines, or turn stone into wood to build a boat. Ruffy uses this skill to move around locations, solve spatial puzzles, and clear paths, turning solid walls into ruins.