BYOND is great for making games. It's a tile-based system with multiplayer capabilities built-in. It's not a point and click game maker, though, you're going to have to learn a bit about the language if you want to use it. The BYOND language (commonly called DM after the IDE, Dream Maker) is a lot like a mix of C++ and Javascript, but uses indentation instead of brackets and semi-colons. Enough of my ramblings, if you want to know more, go to the site. =P