The only size requirement I can think of is that tiles are 16x16, but they can be larger multiples of 16 if you split things into a few tiles. Everything else is pretty much up to you.

It sounds like you have automax enabled (it is by default). That'll automatically take up your entire screen with the game's screen, so that very high resolution screens that suck at fullscreen can see what's going on. Automax might not exist for the Mac. To turn it off, open verge.cfg and change the "automax" setting (or if there is none, put in a line "automax 0").

Anyway, you're best off giving the ability to change the windowing/fullscreen sizing settings up to the user (well, don't let them change the xres and yres).

If you're viewing the game in windowed mode (which is what I usually do), it isn't becoming more blurry, the individual pixels are the same size in the window, it just lets you display more in a larger window.

Although, in fullscreen, the pixels will shrink in order to allow it to fit to the screen, because it changes the actual resolution on your monitor. Nothing you can do about that. If you're in a high resolution, it sort of demands you to make larger sprites, fonts and tiles. This is why people typically use 320x240, because they don't have the time to make all those higher res resources. Although, if your sprites are still readable, then whatever. I can read 320x240 windows just fine in my monitors1440x900 resolution, so fullscreen would just make it larger (although stretched - because I have a widescreen monitor ;_;).

Okay, well, that's because Epic of Serinor forces the game to played in 320x240 resolution in its system.vc. So any changes to xres and yres just end up resizing the window and scaling the screen to fit resolution. This ensures that the player doesn't screw around with their game's resolution settings.

SetResolution(320, 240);

Sully, on the other hand, you can see looks very BROKEN as you can see with resolution changed. But individual pixels stay the same. That tiled pattern goes past the screen because it relies on the screen width to know how much to draw, but pretty much everything else is in the 320x240 top-left block of the screen.

Moral of story: don't change other game's resolutions as an example. Changing resolutions doesn't make things any more "blurry" unless the screen is being scaled to fit the window size.

Resolution does exactly what it should, so don't worry. Just maek gamz.

I think that the blurriness is some kind of hardware/driver/software problem that exists outside of verge. 320x240 works great for me, but whenever I try to run anything (verge or otherwise) in 640x480 I get the blurriness issue. There are comps on the UH campus that don't have that problem though. Not sure about the source of the problem, but I'm pretty sure it's not verge or any of its settings.