Mutant Mushroom - Adventure 2: Sky Castles Sky Castles is the second Adventure in the Mutant Mushroom series. Sky Castles requires the full version of Mutant Mushroom (FREE) to be installed on your computer. Cost: $6 Buy full version       Trial version       Publisher: gaimplay     Descriptions Mutant Mushroom - Adventure 2: Sky Castles: Sky Castles is the second Adventure in the Mutant Mushroom series. Sky Castles requires the full version of Mutant Mushroom (FREE) to be installed on your computer.