There are AC maps that are port of Cube maps, and ac_metl2 is one of them.
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This map have, like metl2, two outside zones. In each one of these zones, there is a CTF flag. However, ac_metl2 have 10 FFA playerstarts but no teamplay ones. This prevent any teamplay in ACR, because, unlike AC, the ACR currents version need teamplay playerstart for teamplay.