Triominos scoring is pretty straight forward, with only some difficulty introduced when calculating bonus points.
Basic Scoring: Players add up the sum of the three tiles on the Triomino they played from their hand to determine their base score for that round. Unless there are bonuses associated with their play, the player adds the sum of all the numbers on their tile to their score.
First Play Bonus: The player to play the first Triomino when the round begins receives a bonus of 10 points. Additionally, if the first tile played is all zeros, they receive an additional 30 point bonus. The right to go first is given to the player with the highest tile that contains all of the same numbers. (0-0-0 through 5-5-5).
Drawing Tiles: Players receive a deduction of 5 points from their score each time they are required to draw due to lacking a playable Triomino in hand.
Last Play Bonus: The player who ends a round by playing their last tile receives a bonus of 25 points.
Hexagon Bonus: If a player matches all three numbers on a tile played from their hand, and it forms a closed hexagon, that player receives a 50 point bonus to their basic tile-laying score.
Bridge Bonus:A bridge links two already played tiles together fusing a third tile played from a player's hand. A bridge bonus of 40 points is granted when a player matches two numbers on a base of a Triomino and matches the third number at the opposite point.
Bridge Match Bonus: After a bridge has been formed, a player receives a 40 point bonus when they extend the bridge by playing a tile on it that matches on two points (see "Instructions" link in resources for bridge and match images).