5/5, addictive, simple, spartan, this is more a timing than a strategy game. It's repetitive just because each level is based on the same concept, with increasing difficulty. It's normal. It becomes boring after 20-25 missions, roughly two and a half hours if you buy Initial Money, Tower Prices, Money per Kill and Towers Damage to the max, but this does not deserve -2 or -1 stars: if you're a nerd, you're free to play it until your eyes begin to melt and your flesh is decomposed; if you ain't, search for another game when you get bored. Nothing but a thing to complain: Kongregate staff members should make the hard badge an impossible one. It's way too nerd, taking over five hours of savage grinding to obtain.