The wild symbol is a spaceship, it can land on all of the reels and it will substitute for all of the symbols, except for the scatter symbol, to help and form winning combinations.
The scatter symbol is a glittering disco ball and it is key to the free spins.
When you land the scatter disco ball on reels one, three and five at the same time the 8+8 Free Games bonus begins. First you will win eight free spins during which the wild symbols are sticky when they lands on reels two, three or four. This means that once one has landed on the reels it will remain in place for the subsequent spins. After those eight spins, you will receive eight more during which all of the wilds that landed in the previous eight remain in place and there will be more wilds added to the fifth reel.
Cosmic Disco offers a huge top payout of 1,000x for landing five of the yellow alien symbols along a payline. The green alien can payout up to 400x, the blue alien can payout up to 200x and the two cocktails can both payout up to 75x. The A can payout up to 50x, the K can payout up to 30x and the Q and J can both payout up to 20x.