The gacha games encyclopedia
A wiki for every gacha game, plus the cross-game reference layer: pull systems, odds, history, and regulation. Every fact cited to a primary source, every page dated, machine-readable by design.
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The concepts everything else builds on, each with sources.
Pity system
A gacha mechanic that limits how unlucky a player can get, either by guaranteeing a top-rarity result at a fixed pull count (hard pity), by raising the rate after a dry streak (soft pity or escalation), or both.
50/50
A featured-item guarantee in which each non-guaranteed top-rarity result has a 50% chance of being the featured character, and a loss makes the next top-rarity result guaranteed.
Spark
A gacha exchange ceiling in which every pull grants a token and a fixed token count, classically 300, can be exchanged for a chosen item from the banner, capping the worst-case cost.
Kompu gacha
A gacha variant, banned in Japan in 2012, in which completing a set of randomly drawn items granted a rarer prize, ruled an illegal "card matching" scheme under Japanese premiums law.
Gacha probability explained
The actual math behind gacha rates. What a 0.6% rate really means, why pity changes expected costs, how consolidated rates are computed, and why set-completion mechanics explode. With an interactive calculator.
History of gacha games
From Japan's first capsule-toy machine in 1965 through the 2012 kompu gacha ban, Granblue's 2016 spark, and Genshin Impact's global era, to the multi-platform gacha industry of 2026. Every date sourced.
One table instead of ten tabs
Pity, guarantees, and sparks across major games, with per-row sources and check dates. Three of 14 rows:
| Game | Base rate | Hard pity | Spark | Worst case |
|---|---|---|---|---|
| Genshin Impact | 0.600% | 90 | none | 180 wishes |
| Fate/Grand Order | 1% (SSR servant) | none | 330 rolls (guaranteed featured SSR | 330 rolls |
| Blue Archive | 3% (3-star; 6% on Fes banners) | none | 200 recruitment points | 200 recruits |
Game wikis
Every game gets its own wiki: rates, pity, guarantees, release history, service status.
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