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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.
All levels are covered in darkness, giving you minimum visibility.
You’ll only encounter spider-like creatures and critters and no other aliens.
The game won’t give you any shield-cards for your deck.
The game won’t give you any tech-cards for your deck.
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.
You’ll only encounter space pirates enemies in all the levels.
You start with no cards and a deck size of only 16 cards.