I remember that Jazz2 originally had a max resolution of 640x480. However, Jazz2+ upped the max screen resolution to 800x600, which is great. Now on my 1080p displays I can do 2x integer scaling with the DirectDraw wrapper dgVoodoo2, and thus choose the resolution of 800x540 to fill most of the real estate of my 1080p displays.

With the resolution height of 540, I can with a 2x integer scale fill my entire screens height. With the resolution width of 800 however, I can fill way more of my screens width than I could with vanilla Jazz2 using 2x integer scaling, but there's still some black bars left on both sides. If the resolution limit for the screens width were upped to 960 however, I could use the resolution of 960x540, and with 2x integer scale that would be 1920x1080, pixel perfect.

I have no idea of how Jazz2+ managed to do add all its feature without the actual source code of Jazz2, but I just wonder if there's hard-coded engine limitations of Jazz2 that made the decision of not adding higher resolutions than 800x600 in Jazz2+?