Eleusis — aiOrion GamesLogic game · Fourth release

Expected October

Eleusis

Every accepted card is evidence. Every rejection is too.

A card game about the scientific method, in both of its published forms: test cards against a hidden rule, read the accepted mainline and the rejected sidelines, then state the rule when the evidence fits. Abbott's Classical game and Golden's faster Express, each scored its own way.

2 games in one2–6Apple OS 27iPhone Duo readyNo adsOn-device play

Coming soon Read the rules

Learn

Learn the game before you play it.

An illustrated, animated walkthrough of the rules, plus a short read on what the game asks of your mind. Both open here in your browser — no download, no account.

How to play Eleusis What it trains in your mind

A guide for every variant

Eleusis Express
How to play Eleusis Express For your mind — Eleusis Express

The rules

How it plays

The app holds a secret rule that decides which card may legally follow the mainline.
Play a card as a hypothesis; accepted cards extend the mainline and rejected cards form a sideline plus a penalty draw.
Declare no play when you believe no card in hand fits, accepting a penalty if the claim is wrong.
After a correct play, attempt the Prophet prediction test to solve the rule.
The round also ends when a player empties their hand or the deck runs out.

Availability note. Expected October is an approximate target. The catalogue opens a few apps at a time, and each release waits until the one before it has settled in.

The family

Mystery · The AI keeps a secret.

The dealer holds a hidden rule. Test cards against it, read the evidence, and name the rule when it fits.

What the AI is to you, across the catalogue

Ways to play

2 games for the price of one.

Every variant here is a game of its own — its own rules and legal-move checking, its own tables, its own illustrated guide, its own daily challenge, its own achievements and its own taught first game that walks you in. One purchase brings all 2. Each option below changes the table while keeping the engine's legal-move checks in charge.

Eleusis (Classical)

New Eleusis (Abbott, 1977): 14-card hands, 2-card penalty, strings, sudden death, classical scoring.

New Eleusis as revised by Robert Abbott in 1977.
The app holds a hidden rule; every player is dealt 14 cards and tries to induce it.
A rejected card is sidelined and costs a two-card penalty; a wrong "no play" costs five, so claiming you cannot move is a real decision. Confident of the rule?
Lay a STRING of up to four cards at once — but every card must be right, or the whole string is sidelined and each one costs the penalty.
A marker goes on every tenth card of the mainline, and once forty cards are down the round enters SUDDEN DEATH: from there a wrong play no longer costs cards, it throws you out of the round. Scoring rewards shedding cards and cracking the rule: a player scores the highest hand-count minus their own, +4 for emptying their hand and +6 for solving the rule via the Prophet prediction test.

Arena

Eleusis Arena — Classical4 players · solo

Tournaments

Eleusis Tournament — Classicalknockout of 8 · 4 a table · solo

Eleusis Express

Eleusis Express (Golden, 2006): 7-card hands, 1-card penalty, fewest-cards-win scoring.

The streamlined modern version created by John Golden in 2006 for teaching inductive reasoning, and endorsed by Robert Abbott.
The app holds a hidden rule; every player is dealt 7 cards and plays a single card at a time. A rejected card costs one penalty card.
The round ends when someone solves the rule (Prophet prediction test), empties their hand, or the deck runs out.
Fewest cards left wins, and solving the rule is worth a bonus — well worth the risk of a failed prophecy, since a wrong guess costs only a single card.

Arena

Eleusis Arena — Express4 players · solo

Tournaments

Eleusis Tournament — Expressknockout of 8 · 4 a table · solo

Every online table is a ladder. Each Arena table and each tournament above comes at four entry levels — Challenge 10 GC, Contest 50 GC, Championship 200 GC, and a Friendly 1 GC table that returns the coin to everyone who finishes. The higher the entry level, the more places share the reward; aiOrion keeps 10% of a paid table's entries to pay for running the online game, and nothing from a Friendly one.

Make it yours. Start from any of these, adjust the settings the game allows, and save it as your own template. Online tables start the same way: copy one of the Arena tables, then set the entry, the rewards and who may join.

aiOrion events

Events in Eleusis.

aiOrion's own tournaments in this game, read live from the game server: when the next ones are and how many places are taken. You enter from inside the app; the entry pays for the online game, and winning earns a reward.

Times are shown in your time zone.

Loading the events

Reading the event calendar from the game server…

All events Add the aiOrion calendar

What is inside

Built around the game, not the grind.

Both published games

Abbott's full New Eleusis and Golden's quicker Express, each scored its own way.

Engine-validated hidden rules

The app keeps a secret rule and judges every card fairly, so your deduction always holds up.

Accepted mainline and rejected sidelines

See the growing line of accepted cards and the rejects beside it — that is your evidence.

Optional rule reveal at round end

Reveal the hidden rule afterward to check how close your theory was.

Induction-focused AI opponents

Opponents that reason about the rule alongside you, offline.

Next move

Follow the releases.

Explore every title now; the month labels are approximate, and each release waits until the one before it has settled in. The same rules and identity run on iPhone, iPhone Duo, iPad and Mac; Apple Vision Pro follows as an update.

Coming soon See all 21 apps

Private local playOn-device AIConfigurable templatesCalm by design