By playing Calculator Monsters and moving their monsters around the playing board, players can practice their mental arithmetic skills in terms of adding or subtracting with numbers up to 100.
The game can be played in two different game modes with different objectives: Player vs. Player or Ghost mode.
Player vs. Player
This game mode can be played either as 1 vs. 1 or 2 vs. 2. In both versions, the object of the game is to push the opponent’s monster off the edge of the playing board which causes them to lose a life.
The object of the game mode is to avoid getting caught by the ghosts for as long as possible. As long as one player remains alive, players who get caught by a ghost have a chance to get back in the game.
Moving around the board
Each player has their own monster that they control with the calculator that has the same colour as the monster. To get their monster to move around the board, the players must make calculations on their calculator. The sum of the calculation will determine to which square the monster moves. To get the monster to move to a specific square, the players must firstly select if they want to add (+) or subtract (-) to the number on which the monster is placed. Secondly, they need to type the amount they want to add to or subtract from the number of the monster’s current location. Thirdly, they must press the “Equals” sign (=). The monster will then move to the square that has the sum of that calculation.
During the game, the following power-ups/-downs randomly appear on the playing board. Collecting these items can either help or hinder the player:
• Ice: Freezes the monster for a short while.
• Chilli: Makes the monster able to touch an ice block without freezing.
• Shoe: Makes the monster move faster.
Loss of life
In the two competitive modes (1 vs. 1 and 2 vs. 2), the players lose a life every time their monster falls off the board. This can happen in one of two ways: Either if the monster gets pushed off the playing board by the opponent’s monster, or if the sum of the players’ calculations is higher than the biggest number or lower than the smallest number on the board.
1 vs. 1
The game begins with the monsters being placed on a random square in each players’ corner of the playing board. To win the game, the players must use their monster to push the opponent’s monster off the board. Every time one of the players’ monsters falls off the board, the player loses a life. At the beginning of the game, each player has 5 lives. Once one of the players has lost all lives, the game is over.
2 vs. 2
When entering the game, the players are briefly shown an image that tells them which monsters are on the same team. The game begins with the monsters being placed on a random square in each corner of the playing board. To win the game, the teams must use their monsters to push the other team’s monsters off the board. Every time one of the team’s monsters gets forced off the board, the team loses a life. At the beginning of the game, each team has 10 lives. Once one of the teams has lost all their lives, the game is over.
To avoid the monsters getting hit by the ghosts appearing on the playing board, the players need to move their monsters away from the ghosts by making calculations on their calculator. As the game progresses, more and more ghosts appear on the playing board which continuously makes it more difficult for the players to avoid the ghosts and forces the players to make faster decisions. When a monster gets hit by a ghost, the monster will disappear from the playing board for 20 seconds before re-appearing on a random square of the board. If all 4 ghosts are missing from the playing board at the same time, the game is over. Just after the game has ended, the game informs the players how many ghosts they survived, so they can try and beat that score in a later game.