Solitaria

In Solitaria you play a card and carry out its action, then the virtual opponent Contrarius reacts as that card's C box says. He has houses, colonists and cards but no storehouse, goods or money; he scores some VP during play and is scored normally at the end, face-down cards included. The usual end conditions apply: if he triggers the end you play one last card with no reaction; if you do, the game ends after his last reaction. A tie goes to the Concordia card holder.