Kompu gacha
The banned "complete gacha" mechanic, where collecting a full set of random items yielded a rare prize. Japan's Consumer Affairs Agency ruled it illegal in May 2012, the genre's first major regulatory intervention.
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Kompu gacha ("complete gacha") was a two-layer mechanic in early Japanese social games: players paid for randomized draws, and completing a specified set of items from those draws granted a rarer grand prize. The completion layer made the odds brutal in a way single draws are not; the last missing piece of an N-item set follows collector-math that most players cannot intuit, and spending on chasing completions became a national controversy in Japan in early 2012. [2]
On May 18, 2012, Japan's Consumer Affairs Agency announced that kompu gacha falls under the prohibited "card matching" (kaado awase) method in the operational standards of the Act against Unjustifiable Premiums and Misleading Representations, with the revised standards applying from July 1, 2012. [1] The ruling was an administrative interpretation of a 1962 consumer-protection law, not gambling legislation and not a new statute. Base single-draw gacha remained, and remains, legal in Japan.
The industry moved before the deadline: the six major platform operators, including GREE and DeNA, announced in early May 2012 that all kompu gacha would be removed by the end of that month, and share prices of both companies fell over 20% while regulation reports circulated. [3] [2] The industry body JOGA issued gacha operation guidelines that September, beginning Japan's self-regulation framework of rate display and spending-estimate caps; see rate disclosure.
Kompu gacha remains the reference case for how the genre gets regulated in practice: an existing consumer-protection law applied to a specific mechanic, followed by fast industry self-regulation to head off broader legislation. The pattern repeated in later disputes; see gacha regulation by country.
References
- Operational standards on premium offers under the Act against Unjustifiable Premiums and Misleading Representations (May 18, 2012 revision) Consumer Affairs Agency (Japan). Accessed 2026-07-09.
- Why "kompu gacha" was banned Game Developer. Accessed 2026-07-09.
- Kompu gacha timeline and platform response Serkan Toto (Kantan Games). Accessed 2026-07-09.
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