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Higher or lower, for cardboard. Two cards face off — pick the one worth more and your streak climbs. One wrong call ends the run. Play the seeded Daily, a quick Round of 10, or chase an Endless high score, then share your streak.

by CollX

Create decks, study in three modes (flip & rate, multiple choice, type the answer), and share with the community. Spaced-repetition-style weighting keeps the cards you struggle with coming back.

by Alustriel92