What if you could play Castlevania over and over and never stop being surprised? That’s what Chasm tries to deliver: a full Metroidvania where every new game has its own unique, randomized map. Its RPG-elements and awesome variety of beautifully animated enemies make it fun the first time through, but it’s that push for replayability that ends doing more harm than good.
The layout of Chasm’s map is randomized, pieced together with pre-built rooms to build a custom map that no one but you will experience. You still progressively unlock new movement abilities in a specific order — like a wall climb or a double jump — that open new paths as you go, but you won’t be able to look up the locations you unlock them in a wiki.
Source: IGN Games Reviews