IN THE FIELD GUIDE
Language1
language1.app
Language1 is a browser-based reverse Taboo prompt game where players give clues avoiding forbidden words to challenge Large Language Models (LLMs) to guess a target word. It evaluates AI comprehension of metaphors, analogies, and vague instructions through prompt optimization under constraints.
THE PRODUCT, BEYOND THE PITCH
Editorially reviewed · Sources checked Oct 8, 2026
A good fit for
- Users interested in prompt engineering and testing AI language model comprehension under constraints.
- Players who want to engage in multiplayer competitive games with custom rules and private rooms.
Know the limitations
- Anonymous visitors are limited to 10 daily games and 1 multiplayer race on default models.
- AI models used are stateless and do not remember previous clues or guesses, so referencing earlier turns is ineffective.
What you can do
- Evaluate and benchmark AI comprehension of metaphors, analogies, and vague instructions through prompt engineering challenges.
- Play a game to improve prompt engineering skills by crafting indirect clues under constraints to challenge LLMs.
Features
- Dynamic validation guard filters out direct synonyms, translations, prompt-injections, or similar word stems to maintain challenge integrity.
- Diverse model selection including Google Gemma, Meta Llama 3, LiquidAI LFM, Qwen 3.5, Amazon Nova, Mistral Ministral, and NVIDIA Nemotron.
- Private multiplayer race rooms with custom target words, forbidden lists, time limits, and invitations.
- Advanced performance metrics including solve velocity, token density index, full prompt histories, and player transcripts.
- Timer tracks active time spent writing clues and pauses while waiting for AI guesses to keep timing fair.
Integrations
Not confirmed yet.
Platforms & data export
- Browser-based game accessible online.
THE COST FOR YOUR TEAM
Go beyond the starting price.
Published plan prices for your team size and usage. Results update as you type. Taxes, currency conversion and unlisted add-ons are excluded, and anything the source did not state is called out rather than guessed.
Known monthly subtotal
$0.00/month
1 of 1 tools could not be priced with these inputs, so this is not the full cost.
| Tool / plan | Monthly | Per year | What this assumes |
|---|---|---|---|
| No pricing recorded yet. Check the official site, or ask the owner to add it. | |||
A practical workflow
- Interactive simulation available to learn how to play step-by-step.
Based on the sources below. Editorial review does not imply hands-on product testing.
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