Domino
Released: 2026-02-22
Missing Domino:
google/gemini-3-flash-preview
After cataloging all 27 dominoes in the set, the sequence of doubles (0-0 to 6-6) is complete, and most combinations are present. By checking all combinations of 6, it is found that 6-0, 6-1, 6-2, 6-3, 6-5, and 6-6 are present in the image, leaving 6-4 as the only missing domino from the standard 28-tile double-six set.
meta-llama/llama-4-maverick
meta
The excluded domino is number 0 and 0
openai/gpt-5-image-mini
openai
In the pictured 27 tiles the counts of halves showing 2 and 6 are each one less than the expected 8 occurrences in a complete double-six set, so the missing tile must be the 2-6 domino.
qwen/qwen3-vl-30b-a3b-thinking
qwen
The standard double-six set has 28 unique dominoes. By analyzing the image (27 dominoes), we identify that the domino with 3 and 5 pips is missing. All other possible pairs from 0 to 6 are present, confirming [3,5] as the excluded domino.
x-ai/grok-4-fast
x-ai
By identifying all 27 dominoes in the image and comparing to the standard set, the [3|5] domino is absent.
Methodology Note
Each model receives the same domino puzzle grid. Models are tasked with identifying the missing domino using only visual clues from the grid. Their answers are evaluated without feedback or retries.