Current fastest growing Facebook games: 'Zoo World,' 'Wild Ones,' and Turkish games

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Fastest growing Facebook games of the week ending January 29: visitor attraction sim Zoo World, animal and fish in island-based Tiki Farm, gritty urban drama in Gangster City.'

Zoo World storms the charts this week, making first place its own as 1.3 million Facebook users try their hand at zoo management, trading rare animals and visitor satisfaction tips with other Zoo World players.

Tiki Farm's growth rate halves from nearly 1 million to 580,000 but with 5.9 million total users trying it (and liking it), a place in the top 20 most popular Facebook games is within touching distance.

FishVille capitalizes on the combined 1 million players who didn't return to Happy Aquarium or Fish World this week by attracting another 730,000 more users to its own particular brand of fish care and collection.

Further down the chart, Gangster City makes an appearance after opening to the public a week ago. Though it plays in a fashion similar to the popular Mafia Wars, its visual style is very much inspired by the best-selling Grand Theft Auto games available for PC, Xbox 360, PlayStation 3, DS, PSP, and iPhone. The Pocket Gamer website was very impressed by it and described it as having the potential to knock Mafia Wars off its perch.

Fastest growing Facebook games on January 29 at 14:30 GMT
01. Zoo World (15,580,024 = +1,385,926 / 8.9%)
02. FarmVille (75,202,137 = +945,859 / 1.3%)
03. FishVille (25,167,566 = +731,271 / 2.9%)
04. Mafia Wars (24,174,812 = +690,893 / 2.9%)
05. Happy Island (10,190,254 = +663,576 / 6.5%)
06. Wild Ones (2,047,119 = +615,522 / 30.1%)
07. Tiki Farm (5,934,285 = +580,013 / 9.8%)
08. Country Life (7,948,844 = +499,024 / 6.3%)
09. Texas HoldEm Poker (24,986,555 = +493,720 / 2.0%)
10. Gangster City (459,799 = +454,127 / 98.8%)
11. My Town (1,445,478 = +435,167 / 30.1%)
12. MindJolt Games (16,022,962 = +401,964 / 2.5%)
13. Island Paradise (7,329,963 = +293,249 / 4.0%)
14. Little Warrior (687,761 = +291,986 / 42.5%)
15. ???? (991,633 = +282,715 / 28.5%)
16. Café World (30,318,438 = +250,469 / 0.8%)
17. ???? (735,080 = +208,430 / 28.4%)
18. The Pink Ribbon (513,924 = +202,981 / 39.5%)
19. Band of Heroes (935,362 = +192,854 / 20.6%)
20. UNO ^TM (2,641,117 = +148,806 / 5.6%)
Numbers in brackets relate to total monthly users, the increase in monthly users, and the weekly percentage growth.
Source: App Data