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).