Baseline (Widescreen) Solution & Issues
Spelunky runs in anamorphic 16:9. Everything scales with the correct aspect ratio.
All common resolutions are listed in-game; resolutions can also be set manually in Data\config.txt in the installation folder.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Aspect ratios wider than 16:9 are cropped.
Eyefinity / Surround Specific Solution & Issues
Aspect ratios wider than 16:9 are cropped.
4k UHD Specific Solution & Issues