Bounce
bounce is a game involving snipers and richochets. two even teams (MUST be red vs blue) are in their own respectable bases. they can see the other team but cannot get a line of sight directly to them due to shield doors. the only way to get kills are to ricochet bullets off the bottom boxes. sniper shots are instant kill, and headshots are 2 points. 3 rounds, 10 points each.
pics:

overview of the bases ^

the wall^

bullets bouncin under^

interior shots, a narrow miss by red team, and blues gettin a kill
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Double Bounce
Double bounce is a spin off of bounce. instead of two straight paralell bases, there are four perpendicular "L" shaped bases. you still must richochet bullets but now you have many targets to aim at. this game is signifagantley easier and faster then the previous version, due to the closer bases.
when in a base yu can aim at the right or left, or due a daring shot across the diagnol, which are rare hits. same rules apply as bounce, but you need four teams. red, blue, orange, and green must be the colors, otherwise it doesnt work properly.have fun!
pics:

overview^

lol, everyone was shooting at me at one point in the game^

i just love bullets bouncing everywhere^
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*on a side note, if you are having trouble getting kills, just align the reticle with the red arrow above the enemies head, and fire.

Gametype:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=77553241

Bounce:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=77553698

Double Bounce:
http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=77554164