Attribute Trio

An open-table pattern game with 81 original cards. Each card has a count, a shape, a fill and a border. Three cards make a trio when every one of those four is either the same on all three cards or different on all three.

Find three cards where every attribute — count, shape, fill, border — is all the same or all different.

FreeOn this device

Deal

0 found · 15 cards on the table · 66 in the deck · 0 selected.

Controls

Select three cards by tapping or with the keyboard (Tab to a card, Enter or Space to select), then press Submit.
Clear selection empties it. Hint highlights a card that belongs to a trio on the table.
Choose Untimed, Timed (three minutes) or Beginner, and one of twelve deals.

The rules

For each attribute separately — count (1, 2 or 3), shape (circle, triangle, diamond), fill (outline, striped, solid) and border (single, double, dotted) — the three cards must be all the same or all different.
Any two cards have exactly one card that completes a trio with them.
Twelve cards are dealt. A found trio is replaced from the deck; if no trio is on the table, three more cards are added. The game ends when the deck is empty and no trio remains.
Beginner uses the 27 cards with a single border, so only three attributes vary.

Scoring, saving and limits

Your score is the number of trios found. Untimed, timed and beginner keep separate best scores on this device; hints used are shown with the result.

The game in progress and your best scores are kept on this device. Download a backup to move them; Clear this game deletes only Attribute Trio's data.

The timer counts only while the page is visible. Every deal is a reproducible shuffle of the same 81 cards from its seed.

Questions

Is there always a trio on the table?: When there is not, three more cards are added automatically, until the deck runs out. If the deck is empty and no trio is left, the game ends.
Why was my three not a trio?: At least one attribute had two cards the same and one different. The message names which attribute, so you can see where it broke.
Is this the same as a commercial card game?: It uses the same mathematical idea — three values of four attributes — with original cards, names and layout made for Zerdly.