A tourist space liner is overtaken by monsters capable of disguising themselves as humans. The bravest passengers decide to fight off the aliens and save civilians. But who's human and who's a monster?

For humans

• Trust no one: analyze other players' actions and figure out who the monsters are.
  
• Save passengers and destroy the aliens.
  
• Combine various weapons to get unique abilities and turn the tide of the battle.
  
• If a monster infects you, you only have a couple of turns to heal. Otherwise, you'll become a monster too!

For monsters

• Disguise yourself to move around safely.
  
• Earn the trust of other players and avoid their suspicions.
  
• Infect passengers to be reborn in their bodies if they kill you.
  
• Infect your opponents to turn them into monsters.
  
• Use the aliens' psychic connection to see what other monsters see.

Two-stage turn-based gameplay

Each turn consists of two time-limited phases:

• Planning: players select actions
  
• Action: all planned actions are performed simultaneously