First game of quantities and 2-way counting: the child counts the elements featured on a challenge card, then carries the result on the abacus. The self-correcting game includes 1 wooden abacus 20 x 10 cm with 4 colour-coded rows of 10 beads, 20 challenge cards 20 x 20 cm with the answers on the back, and 1 detailed, multilingual rule.