A simple, mediocre flash game. Just spam Spears and Horsemen alternating between the two and you win every match. Upgrade towers to max first because their cost isn't increased by upgrading. Don't upgrade spears and horses to max until lvl 8-10 otherwise you won't be able to afford them. The game could run a bit slower but 1x speed is as fast as you need as each level takes about 60sec to win. Finally the ads sometimes bug out but if you use the TAB button and spacebar you can still upgrade and continue to the next level. 19 levels, difficulty does not really increase unless you consider spamming units faster difficult.