Principia: version 2026.07.15 released with UI fixes

Principia, a physics-based sandbox game, has been released in version 2026.07.15.

The update fixes several issues around the new Dear ImGui interface and, on Linux, reverts back to using X11 (via XWayland on Wayland), fixing crashes on GNOME.

Fix new Imgui-based play menu popup not showing up

Revert to using X11 (using XWayland if on Wayland), fixes crashes on GNOME

Use Imgui for the “New level” dialog on desktop

Adjust font size in Imgui dialogs (should be more in line with the medium font size in the rest of the UI)

Fix plastic polygon being editable while playing a level

Fix crash in Imgui code when hiding the GUI

Sandbox menu now appears when the ESC key is pressed rather than released

Remove redundant tooltip for timer objects

Principia

Source: GitHub