Basic game guide
Normal attack: click my planet -> click enemy planet
Missile attack: touch down my planet -> drag ->touch up enemy planet
Item: click my planet -> click item
Help my planet: click my planet -> touch down my planet -> drag ->touch up enemy planet
Planet level up: automatically go up depending on the time
Ships production: Depending on the size and level
Item: There are four kinds of items. (Attack, defense, speed, missile)
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