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Play on a "Space Slots"-slot machine.

When starting - it will display the current mission.
The mission is to collect either:
Blue Aliens
Planets
Crystals

Continue to collect till the mission-bar is filled. (Higher bets progresses the mission-bar more for each Alien/Planet/Crystal collected.)

When the mission has been completed - a bonus is provided untill the mission-bar is depleted.

When depleted, a new mission will be started (could be the same as the one recently completed).
If so, leave the slot machine and try another one - till you find a "new"/unfinished mission.

Repeat the steps above for: Aliens, Planets and Crystals - at least once for each one.

If You leave a slot machine before completing the mission - it will reset (and could even change the mission).