Secret Number

Secret Number is a deduction game from Japan.

The publisher says:
Players are dealt two number cards each, and the object of the game is to reveal one of the two number cards not dealt and guess the number of the one not revealed. Players add, subtract, multiply or divide the two numbers dealt to them and reveal the result of their calculation. The game is a game of calculation and deduction in which players try to guess a hidden number based on the results of calculations revealed by other players.

プレイヤーには2枚ずつ数字カードを配り、配られなかった２枚の数字カードのうち１枚を公開し、公開されていない１枚の数字を当てることがゲームの目的です。プレイヤーは配られた２つの数字に足し算・引き算・掛け算・割り算のいずれかを行いその計算結果を公開します。他のプレイヤーが公開した計算結果をもとに伏せられた数字を推理する計算・推理ゲームです。
publisher's summary