Grand Theft Mongoose is three minigames in one. Each is based on the kind of morality-free hijinks you'd find in the Grand Theft Auto series.

Detailed description

I. The map on which this all takes place is called GTM: Forerunner City. This is deceptive though because it's more than a city - it's actually a lengthy course that winds through the city, a cave, under (or around, or over) a security wall and guard tower, and finally all the way through Hemorrhage canyon to the beachfront where a small safehouse resides.

II. a. The first and primary minigame, the one for which this map was made originally, is simply Grand Theft Mongoose. It's a speed flag variant. In speed flag you pick up the flag automatically and throw it on your back, allowing you to still shoot and throw grenades. Grand Theft Mongoose takes this idea and turns it into a GTA-like courier mission. The flag is a valuable package (contents probably illegal). Whoever picks it up has to take it from Forerunner City to the safehouse on the beach. His teammates have to help him by giving him a ride (he can't drive), providing a convoy AROUND his ride perhaps, shooting the cops on the other team, etc. The offensive team spawns in a garage sealed off with one-way shields; inside and nearby they will find plenty of mongooses, a few weapons, and teleporters that activate after a certain amount of time to allow them access to some high places where they can rain destruction down on the guard tower and wall. (The courier shouldn't be able to use these teleporters as he can't jump and they are all elevated on platforms.)

If you are a cop (defender) in the round, your goal is simple - just stop the flag runner and kill his teammates if necessary. The courier will have a waypoint over his head to make tracking him easy. Once the flag hits the ground it resets within five seconds. Your weapons are weak so it will take some effort to kill anybody, especially the courier. Don't worry though, their weapons are weak too - except that pesky courier, he's a little juiced or something. If you die after your initial spawn in the city, you'll respawn out on the guard tower and security wall, and you'll find a helpful warthog out there. Don't forget to use it or let the criminals grab it!

II. b. The second minigame is called GTM Invasion, and it's where the crooks take revenge for their fallen comrades by bombing targets throughout Forerunner City, as well as that guard tower. Bombs spawn near the garage - just take them to the objective points. Crooks always spawn around the garage and the bomb, while cops spawn in different locations in each phase depending where the objective points are. The warthog appears in late phase 2 or early phase 3, but be careful - the crooks get a rocket launcher around that time too. Like Grand Theft Mongoose though, this is more about rolling around on mongooses and blasting each other with regular weapons than it is about the usual assortment of power weapons and vehicles. Not that kind of invasion!

II. c. The last minigame is a familiar one, Race. The standard race variant will do. Just ride from the city to the beach and back again to complete a lap. This is pretty much an endurance race - the course is long, not overly tricky but filled with the occasional obstacle and interesting race flag location, so keep your speed up and try not to hit any bumps along the way.

Video
YouTube - Grand Theft Mongoose (Halo:Reach minigame map)

Screenshots

DOWNLOAD LINKS

The MAP | Grand Theft Mongoose GAMETYPE | GTM Invasion GAMETYPE

Additional note

I am finalizing a standalone Big Team Battle version of Forerunner City, minus the GTM part. It should be released soon, and will support all standard gametypes (even invasion). A little bit of the footage in the video above shows this version of the map, which has a lot more aesthetic detail and some additional structures & other changes in the city.