21 — Nim
21 stones on the table. Each turn take 1, 2, or 3. The player forced to take the very last stone loses. Simple rules, deep strategy.
About the 21 — Nim
The 21 — Nim on ToolHaven is a free, browser-based tool that helps you 21 stones on the table. Each turn take 1, 2, or 3. The player forced to take the very last stone loses. Simple rules, deep strategy. It runs entirely in your browser, so no data is sent to any server, and no account or signup is required. Whether you are a student, professional, or just someone looking for a quick answer, this tool gives you accurate results in seconds.
How to use the 21 — Nim
Using this tool is straightforward. Take 1, 2, or 3 stones on your turn. The player who takes the last stone loses. Play against the CPU (Easy or Hard) or pass the device to a friend in 2-Player mode.
Results are updated instantly as you enter values, so there is no need to click a submit button. You can adjust inputs freely and compare different scenarios in real time.
Why use ToolHaven?
ToolHaven offers 178+ free online calculators and tools across categories including Finance, Health, Math, Education, and more. All tools are free to use, require no installation, and work on any device. Your inputs never leave your browser, so your data stays private. The 21 — Nim is part of our Fun collection. Explore related tools in the sidebar to get more done in one place.
How to use
- Take 1, 2, or 3 stones on your turn.
- The player who takes the last stone loses.
- Play against the CPU (Easy or Hard) or pass the device to a friend in 2-Player mode.
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