Nox features ninety cards, thirty each in
orange, green and blue. Each player starts each round of play with three
cards in hand. On a turn, a player either:
- Plays one card in front of herself or another player to expand that player's kitty, or
- Plays that card on top of a matching-colored card in any player's kitty.
Any time that a player has two stacks topped with a card of the same
number, those stacks are merged into a single stack. After playing, the
player draws one card from the deck.
As soon as one player has six separate stacks in front of herself or
all players have no cards left in hand, the round ends. Any player
without stacks topped by cards of all three colors scores zero points
for the round; all other players sum the numbers shown on the uppermost
card of each stack they have. Rounds continue until at least one player
has scored at least 150 points. In this case, the game ends and the
player with the most points wins.
For a harsh variant, players can decide that only the player with the
most points each round scores, while everyone else receives zero
points. In this variant, the game ends once a player reaches 100 points.