Baseline (Widescreen) Solution & Issues
The game will run at 1280x720 by default. From the title screen, navigate to the Video settings in Help & Options to manually confirm your desired resolution.
Resolution support is quite random, though ! For more details see the DR's discussion thread.
Screen change is roughly "Vert+ from HD" but as a PS3 port, Castle Of Illusion actually tries to rock both 16:9 and 4:3 simultaneously.
- 16:9 FOV is Hor+/Vert- compared to 4:3. Non-16:9 widescreen FOV is mostly Hor+.
- Most of the HUD scales correctly, although some fonts look squished in narrower aspects.
- 2D art however is strictly Vert- !
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
The Game only supports resolutions till 16:9 - you need to HEX edit to get it HOR+
Hex edit resolution: Go to --> ...\Steam\steamapps\common\Castle of Illusion\COI.exe
2560x1080: Go to Offset 6040 look for 00 05 00 00 C7 44 24 3C D0 02 and change it to 00 0A 00 00 C7 44 24 3C 38 04
3440x1440: Go to Offset 6040 look for 00 05 00 00 C7 44 24 3C D0 02 and change it to 70 0D 00 00 C7 44 24 3C A0 05
Now you need to go the the Registry to remove the resolution selector - go to [HKEY_CURRENT_USER\Software\SSA\COI] and DELETE the Line with the ScreenResIndex: "ScreenResIndex"=dword:0000000c
I added the Fixes in the files available from the PC Gaming Wiki Community Files (search there).
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Optional FOV edit:
To have the same FOV as in 4:3 you need to hex edit another Instance: Go to Offset 2D4EE0 and change C7 71 FC 3F into 00 00 06 40 - see Additional FOV Screenshots.
Eyefinity / Surround Specific Solution & Issues
Same solution as in Ultra Widescreen, but in 5760x1080 you will see 2 Black bars on the sides.
5760x1080: Go to Offset 6040 look for 00 05 00 00 C7 44 24 3C D0 02 and change it to 80 16 00 00 C7 44 24 3C 38 04
4k UHD Specific Solution & Issues
