About Extreme Demon Gacha Tools
Extreme Demon Gacha Tools is an independent set of companion tools for Extreme Demon Gacha. Real play stays in the original game; calculations and practice pulls happen here.
Where the card data comes from
The card catalog is a local snapshot of the original game's public rates API. We preserve each card's published probability, value, rank, creator and thumbnail reference. The snapshot date appears below the tools.
Each update uses a fresh copy of the published rates. If a card changes in the game before our next update, the two values may differ.
The calculations.
- At least one target in N packs:
1 − (1 − p)^(5N), assuming independent slots. - Holo target probability per slot:
p × holoChance. - Pack simulation: weighted selection using the complete card probability distribution, followed by a separate Holo roll.
- Score comparison: Holo copies occupy the first positions at 3×; later copies add their copy-weighted fraction.
These tools do not audit the original server's random number generator. A simulator matching the published rates does not prove the original game uses those rates internally.
Sources.
- Extreme Demon Gacha — original game.
- Public rates endpoint — the primary card data source.
- All Rated Extreme Demons List — underlying level rankings.
- Gacha Demon guide — secondary reference for gameplay and scoring.
Independent by design.
No original game credentials are requested. A simulated card never becomes a real game card. Trade scores do not express cash prices. Code records explicitly state whether a redemption has been verified.
Not affiliated with the original game, AREDL, RobTop Games or Geometry Dash. Video thumbnails and level identities belong to their creators.
Contact the site
We maintain the simulator, Card Atlas, and player guides at extremedemongacha.app. To report an incorrect card value, a scoring discrepancy, or an accessibility issue, email support@extremedemongacha.app. Include the page and card name so we can reproduce what you saw.