How to play SUMIGI - LONG VERSION

About Matematigi Collection, from BoardGameGeek:

The Matematigi Collection is a fast, strategic trio of math card games that turns addition, multiplication, and prime factorization into an exciting race of logic, memory, and tactical disruption. Players engage with blue Addend, Factor, and Prime Number cards alongside red Sum and Product cards. On each turn, they decide whether to declare a valid mathematical set, disrupt an opponent with an attack card, or draw to strengthen their hand. Across all three games, the core experience revolves around building the right numerical combinations to match the values shown on a player's open red cards. Declaring a set requires both accuracy and clarity: players must show their cards and verbally state the correct calculation, whether forming sums, products, or prime-factor products. A successful declaration closes one of their red cards; an incorrect declaration discards the attempt with no progress. Special cards such as “Exchange,” “-2 blues,” “+1 red,” “Stop,” “Bounce,” and each game's wild card-“Sumigi,” “Multigi,” or “Faktorigi”-shape interaction and sabotage, while additional tools like the “Square” and “Cube” cards appear in the more advanced games, creating shifting opportunities for clever timing and defense. The Matematigi Collection blends hand management, pattern recognition, and tactical card play. Players must evaluate probability, manage risk, and track opponents' positions while identifying efficient additive, multiplicative, or prime-factor combinations. Whether played casually or competitively, the collection rewards flexibility, math intuition, and quick decision-making, offering a progression of difficulty that grows with the player. The goal in each game is simple: be the first player to close all your red cards. With multiple modes of play-including team, scoring, match, and elimination variants-Sumigi, Multigi, and Faktorigi together offer a blend of educational value and engaging strategy that scales across ages, experience levels, and mathematical readiness. -description from the publisher