インチキ大富豪 (Inchiki Daifugō)

From BoardGameGeek:

Inchiki Daifugo is a ladder-climbing card game built around variant rummy-style grouping and strict hand management. Your goal is simple: be the first to empty your hand. Despite the name “Cheat,” there is no bluffing-success depends on numerical ordering, combination efficiency, and careful timing. Low cards and high cards are equally important, and precise hand control is essential. Normal GroupsCards can be played as standard groups, such as multiple cards of the same number (e.g., 3-3-3-3). Up to two colors may be mixed within a group. Variant Groups (“Cheat”) In a “Cheat” group, the number of cards played defines the minimum value of the set. Players may include cards equal to or higher than that minimum value, and the highest number among them determines the group's strength (e.g., 4-4-6-10 → treated as 10-10-10-10). There is no deception involved-the structure is entirely numerical.