Good once you buy out the ads. Unplayable with interrupting ads. After buying out ads, you can still voluntarily watch ads to get extra resources, but they stop interrupting. It's worth the six bucks. I'm running an Android One+9 and this game plays well, but it absolutely EATS battery life. Playing for an hour will use 40% of battery. Even paused in the background it still uses significant power. The game is a fun little resource collection game. Combat is primitive and no challenge unless you have wandered somewhere you shouldn't. Gameplay is very linear, however, so it's hard to get off track. Keep upgrading your tools appropriately and you won't have problems.