Re: reach super ultra very high by using sandbox2!
Go to the "....\Crysis\Game\Levels\" folder and rename the "island" folder to "island_crytek", and then copy the folder (island) from the rar-file into the "Levels" folder. Start the game, select "New Game" and the custom level loads. Don't worry about losing savegames, ain't gonna happen.
Intel I7-920 aircooled by Prolimatech Megahalems @ 3.8Ghz (200x19) | Gigabyte GA-X58-UD3R | OCZ Platinum 3x2GB DDR3-1600 RAM (7-7-7-24) @ 1600 | Gainward GTX 480 | WD Raptor 74GB + 150GB + Samsung 1TB | Soundblaster X-Fi Platinum | Corsair AX850 Gold | Coolermaster Stacker 830 silver | Logitech Z-5500 Digital 5.1 | Logitech G15 keyboard | Logitech G25 Racing Wheel | Sharp LC-46 XL1E (gaming and work)