We just installed a patch that makes our protagonist punch so hard, he'll send enemies flying into the sky, and if you're feeling slightly more hardcore you can replace models and textures in the game to give yourself new cars and buildings. There's also a "GTA3.set" file that can improve the graphics, and a few DAT files that can be opened in a text editor to change all sorts of variables, from the mass and elasticity of a traffic light to the rate-of-fire for each individual weapon. Just make a backup of your original directory before you begin, so you don't lose anything! Take a peek at a few of the possibilities (and a how-to video) below.