but not working in sdl games.. why? what is the difference between opensource and sdl games exactly?
The menu item "SDL Games" uses a lib from Ayla to center the games on the screen without the need to recompile it. This only works with some of the SDL games. I don't know why it doesn't work with the other SDL games. Maybe Ayla has an explanation for this.
Arkanoid is a SDL game but it's recompiled with the sdlwrapper.cpp to center the game on the screen. You have to start it from menu item "Open-Source Games".