4 FFA, 2v2 or 1v1 map. Can be found on EU Battle.net: Multplayer -> Create a Game (Custom Game) and search Cityscape Plaza.
Cityscape Plaza is a map created to test the saying "simple is best". The layout is as basic as it gets - each player starts on high ground with a narrow ramp leading to a natural expansion, which is on a large plateu. There is one plateu for each player with two expansions each, and they are seperated by low ground with ramps that allow a direct (quick) path to the opponent. The second expo on the plateu is next to a second entrance to your main that's blocked off by rocks. Other features include two island expansions, 3 secret paths blocked by rocks, two hidden areas to hide armies and two XN towers that let you see the main attack paths and the two rich expansions in the middle.