You can't, you automatically have it, but if you have the full version you can make tweaks, but you can't if you the Trail or demo.
You have to get Halo CE for the PC, and run the game in Dev mode.
You might like lost planet 1 or 2 or section 8 which are games very similar to the halo series. <i was asking for a game with a similar mode to halo reach's forge mode
Do story mode.
there is only 1 character you have to unlock and that is Sheen. to unlock him play on the tournoment mode, then, beat him at the last person. he will always appear.
There is two ways to get it #1 unlock all of the armor #2 is to become the highest rank in halo reach
Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
I completed the game in god mode.
You get.....Two discs.Disc 1: Halo 3 ODST campaignFirefight Game Mode.Theatre mode. (to watch all your firefight matches)Disc 2: Halo 3 Multiplayer.(basically a halo 3 game disc minus the campaign mode)Heretic, Longshore, and CitadelAll the other multiplayer maps ever released as DLC.Custom games mode.Forge modeTheatre mode
Lucky for you, there is now a way to easily unlock recon armor. There are a few steps you must complete to unlock Recon armor in Halo 3. 1. Buy Halo 3: ODST 2. Create a bungie account. 3. Complete the vidmaster achievements on Halo 3 and Halo 3: ODST. There are 7 in all. 4. Under your account preferences, click Unlock Recon. You should now have recon armor. RUB IT IN THEIR FACES!!!
To play campaign mode in Halo Custom Edition you need a custom AI file. Downloadable from http://hce.halomaps.org/index.cfm?pg=1&sid=26 . You need to download a custom AI file with Campaign mode and put it in the 'halo/maps' folder. Don't forget to backup the original AI file (just rename it).
Unlock Mirror Mode by playing 50cc, 100cc, and 150cc. You have to get 1st place in each cup and mode. Then get a star rank in each cup in mirror mode. Or, you could have Super Mario Galaxy 1 and get a gift.
Do you have a Super Mario Galaxy save?If you do, unlock her by winning all 50cc Cups.If you don't, unlock her by getting at least a 1 star-rank in all Mirror Mode Cups.To unlock Mirror Mode, WIN all 150cc Cups. Hi!