Enemies are approaching. there are 10 waves of them. we need to survive. there are 3 types of towers you can build: laser - the fast one, v-beam - the stronger one; its beam covers all tiles above and below, therefore you cannot build anything else on its way, booster - this one makes all surrounding lasers and v-beams shoot longer and re-charger faster; you can "stack" boosters to increase total boost – each laser can be boosted up to 8 times and each v-beam up to 6 times (not 8, because 2 tiles are reserved.
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