Gemini

Description
Gemini is a memory game where the player needs to locate either pairs or triplets of identical cards. The cards are placed face down and, each turn, the player can flip two or three cards over anywhere on the screen. If these cards are all identical, they stay face up, and the score increases. Conversely, each unsuccessful trial decreases the score.
The difficulty level can be adjusted before the game starts and affects the number of cards (from 20 to 36), the type of symbols on the cards, and the number of cards in a set (either a pair or a triplet). The game can be played either with one or two players.
The game is entirely played with the light pen, which came as standard on most Thomson computers.