Mathable Junior

Like in Mathable players place the number tiles on the Scrabble-like board. Tile what is placed must be result of addition of subtraction of 2 adjacent tiles next to it horizontally or vertically. Some squares also have special symbols. Players have less tiles in hand than original Mathable. Each tile placed counts its value as points. Game ends if any player plays his last tile or everybody passes. Player with the most points is the winner.