A tetromino board game for two players with blind bidding
- A board with nine fields, each of which has nine spaces
- Five cards for each player, with the five tetromino shapes and numbers one to five.
- A pencil for writing X's and O's on the board
Control five fields to win the game. Control a field by filling in five spaces.
One player shuffles the five X cards and lets the other player pick two cards. Without looking at them, the player that picked the cards hands one of them back. Then both players reveal their cards. The player with the higher number takes the X cards and leaves the two revealed cards face up on the table in front of them. The other player takes the five O cards in their hand.
At the start of each turn, each player secretly chooses two cards from their hand, then both players reveal their chosen cards. Check to see how many cards match the other player's choices.
If the players chose four different shapes, then each player gets to fill in spaces with their X or O symbol to make the chosen tetromino shape. Players fill in the shapes in order: I, L, O, T, Z. Players may fill in the shape on the card or its mirror-image shape.
If players chose one matching shape, then they may fill in two copies of the other shape they chose.
If players chose both shapes the same, they don't fill in anything.
In order to fill in a shape, there must be four empty spaces in the right positions to make the shape. If there is nowhere available on the board to make the chosen shape, skip that shape.
If a player fills in a shape that leaves a gap of three or fewer spaces, the other player fills in the gap.
At the end of each turn, the player with one card left in their hand picks up their four cards from the table. The other player should have three cards in their hand, and doesn't pick up any.
When a player has filled in five or more spaces in a field, they control that field. When a player controls five or more fields, they win. Players may still fill in empty spaces in a controlled field.