Baseline (Widescreen) Solution & Issues
Native Hor+ support. Tech: Unity.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Native Hor+ support.
Scenery of the more vertical levels tends to end abruptly beyond 16:9.
Eyefinity / Surround Specific Solution & Issues
Native Hor+ support but not much to see on the sides except glitches.
TripleWidescreen mostly reveals the limits of level architecture so you may prefer an UltraWide-like aspect: use launch parameter -screen-width to constrain the picture to a narrower resolution, pillarboxed (see Additional Screenshots).
4k UHD Specific Solution & Issues