A game of induction

Eleusis

Discover the hidden law.

A secret rule decides which specimens may join the chain. Choose what to test, watch what nature accepts or casts aside, then publish your law when the evidence makes sense.

Play free on the web Explore the iOS app

Free browser challenges · Native iPhone and iPad game in development

The chain — accepted specimens
Accepted cards grow the chain. Rejected experiments remain as evidence.

Choose your laboratory

The same hidden-law idea, in two different forms.

Free · available now

Web

Choose your next hidden law.

Pick a difficulty, run as many careful experiments as you need and compare your score with par. When one law is not enough, choose another and begin again.

  • Four difficulty levels
  • No download or account
  • A guided first challenge
Play Eleusis free
iOS · in development

Eleusis Axiom for iPhone & iPad

Take the full laboratory with you.

Start with the guided tutorial and first five campaign challenges. A single full unlock opens the complete campaign, endless free play, the daily law and multiplayer.

  • 100-challenge solo campaign
  • Daily, free play and optional iCloud progress sync
  • Online or same-room multiplayer for 2–6

App Store link at launch

The direct App Store destination will be added here when the listing is public. Final storefront price will be shown by Apple. Read the Eleusis Axiom privacy policy

Think like an experimenter

The rules are hidden. The evidence is not.

  1. 01

    Choose a specimen

    Pick its number and colour deliberately. A useful test can reveal more than an easy success.

  2. 02

    Read nature’s verdict

    Accepted specimens join the chain. Rejected ones stay beside it, preserving the clue that your theory must explain.

  3. 03

    Publish your law

    Predict five new verdicts. Get them all right and the hidden law is yours.

Which edition is for you?

A quick puzzle, or a deeper game to keep.

The web edition is the fastest way to meet Eleusis. Eleusis Axiom grows that solo puzzle into a native campaign and brings back the shared-chain tension of multiplayer play.

Best for
Web A free puzzle whenever you want one
iOS Campaign, replay and multiplayer
Cost
Web Free
iOS Free to try, one-time full unlock
Solo play
Web Four difficulties and another challenge on demand
iOS 100 challenges, daily and endless free play
Play together
Web Solo
iOS 2–6 players, online or nearby

The game behind the experiment

An ingenious idea from 1956, made clear for a new screen.

Eleusis was invented by Robert Abbott and first brought to a wide audience through Martin Gardner’s Mathematical Games column in 1959. Its central pleasure is induction: learning an unknown rule from the evidence created by play.

The web edition and Eleusis Axiom are Mindful Echo adaptations with their own visual design, progression, rules wording and guided solo puzzle. The native multiplayer ruleset also draws on Eleusis Express, developed by John Golden.

Your first experiment is free

What do you think the law is?

Open the web edition now. Eleusis Axiom will join it on the App Store when the native game is ready.

Play free on the web Return to Forgotten Games