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An easy to use, fully adjustable space lab with Einstein's special relativity equations in a three-spacecraft configuration. Play around with time dilation and relativistic Doppler effects in space at your own pace. Multiple viewpoints in 3D, real-time, with data export functionality.

Player counts over time, as we observed them.
Source: Steam Web API, ISteamUserStats/GetNumberOfCurrentPlayers. Full methodology
| Month | Average | Change | Change % | Peak |
|---|---|---|---|---|
| October 2026Oct 2026 (from 29 Oct) | 0 | — | — | 0 |
Average and peak concurrent players each month, and the change in average players from the month before.