Play the game, modify it or create a new one. 20 levels, 3.000 enemies, fast. 6 new weapons, 5 new enemies, original ingame music, dood sounds for enemies, weapons, itens and menus.
The pack that I made to create "The 20th Zone". Just the way it is. All enemies, sprites, animations, levels, midi songs, HUD weapons bitmaps, icon... Everything.