Philip Williams
Basic design, could do with a spruce up, especially the sounds, but the game's simplicity means it works despite your android version. Ways it could improve? Adding mathematical options to start with (i.e. multiplication, division, etc) would be cool, also a time-trial mode where answers give add to a timer but wrong ones subtract. Perhaps including a daily streak counter which levels up with more difficult equations, that resets if you miss it 3 days in a row, or incorrectly 3 times in a row.