Spot it! 1,2,3 features the same game play as its parent Spot it! but in a simplified manner so that younger players can play, too. (Spot it! Numbers & Shapes, Spot it Jr.! Animals, and Spot it! Alphabet feature different images on their cards, but they have the same number of cards and the same gameplay.)
Note: some of the different editions have slightly different rulesets (see e.g. uploaded files of different versions). Some editions (e.g. Dobble Beach with its waterproof cards) even feature the aim of playing through all the minigames and the player who won the most minigames wins.
Each card in Spot it! 1,2,3 features six different numbers, with the sizes of numbers varying from one card to another. Any two cards have exactly one number in common. To play, reveal one card, then another. Whoever spots the number in common on both cards claims the first card, then another card is revealed for players to search, and so on.
Whoever has collected the most cards when the deck runs out wins!