@Pogo _SoM "ResHack" is meant to increase (by multiplying) the internal resolution of PSX games beyond what Pete'sOGL2 2.9 allowed. If you set the "internal X and Y resolution" in the Pete'sOGL2 GUI to "2 and 3" respectively, it would be the same as setting the Tweaks .ini option "ResHack's" Mul X/Y to 4 and 8, respectively (someone correct me if I'm wrong XD). So in the ini, you can set numbers even higher, generally to match what monitor resolution you use, or to what your GPU can handle. It works as an "anti-aliasing" method, since plugins do not support common methods. This option is most useful for 3D games though, since 2D games will only get upscaled and generally sharper, and if too high, it will make things slow. But if you're using xBRZ, this will already "smooth and sharp" the pixels, so setting "ResHack" to something like Mul X/Y > 4/4 would be enough for 2D, if you have a xBRZ setting of 4 as well. You can also leave "ResHack" set as "0" and use the plugin's GUI internal resolution option instead, it works the same, but not higher than what I stated.