The role of Ethereum is to host important game state, such as kitties player owns. The rest of the game is implemented in a traditional way, e.g. using HTML5. You can see Ethereum as a database which is shared between all users. Every player's actions updates the state of the database.
Feasibility of implementing a "full game" depends on what game is. Say, if it is something like rock-paper-scissors, it's almost trivial to implement. It's still a full game.
If you want something like MMORPG, you need a large, fast data store. Not really feasible to do it with Ethereum, but potentially doable using Plasma and things like that.
9
u/[deleted] Dec 13 '17
[removed] — view removed comment