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Hi, some in game objects such as shooting spikes, cogs, and the "buddy" who stays in your character's furnace do not appear on screen. The minimum requirements posted on Steam are:
OS: Windows 7
Processor: 2 GHz, SSE2 support
Memory: 1024 MB RAM
Graphics: OpenGL 2.1-compatible, 512 MB video memory, framebuffer object support. E.g. Intel HD 4600 or better.
Storage: 350 MB available space
Additional Notes: You may need to update your graphics drivers for OpenGL 2.1 support.

According to GLView application, my Intel HD has 100% 3.1 OpenGL core support, 70% 3.2-3.3 support, and finally only 21% 4.0 support. Under 3.0 I see support for [GL_ARB_framebuffer_object] extension. This appears to meet the minimum system requirements.

I note that the minimum requirements mention Intel HD 4600 or better...but why the relatively low OpenGL 2.1 requirement then?

There is a related thread here [].
Post edited December 04, 2017 by jda2158