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Challenges are an alternate game-mode available in the game. A challenge has a shorter game-session (covering only 5 levels) but adds different rules to the game depending on the challenge.
Challenges are played without the use of Buff cards.
The Dark
All levels are covered in darkness, giving you minimum visibility.
Spiderman
You’ll only encounter spider-like creatures and critters and no other aliens.
Shield-less
The game won’t give you any shield-cards for your deck.
No Tech
The game won’t give you any tech-cards for your deck.
The Martians
You’ll only encounter martian enemies in all the levels.
Low on Cards
You start with just 12 cards, and a deck size of 32 maximum.
Pirates a-hoy!
You’ll only encounter space pirates enemies in all the levels.
Empty handed
You start with no cards and a deck size of only 16 cards.