We’re seeing increasingly high-quality games from a broad range of developers on this week’s top 20 up-and-coming list. While Zynga, Playfish and other well-known companies continue to dominate in overall numbers, the growth on this list highlights the potential for many developers to grow big.

	Name	MAU	Gain	Gain, %
1.	Ultimate Slot Machines	888,711	+404,513	+45.52
2.	Poker Rivals	256,833	+254,508	+99.09
3.	Ask a Friend	694,366	+171,798	+24.74
4.	Santa Yourself	268,929	+166,699	+61.99
5.	Youtopia	193,137	+134,537	+69.66
6.	Ponzi, Inc.	253,201	+126,088	+49.80
7.	歡樂癲地 Funland	463,766	+122,990	+26.52
8.	The Hierarchy	671,010	+120,246	+17.92
9.	Piou Piou contre les cactus	655,362	+114,432	+17.46
10.	Ninja Warz	284,744	+95,929	+33.69
11.	GooBox – Giochi gratuiti	196,546	+86,858	+44.19
12.	Icy Tower	942,282	+78,064	+8.28
13.	魔力學堂Web	255,959	+77,565	+30.30
14.	Top Fish	233,424	+63,457	+27.19
15.	Bite Me	100,973	+62,678	+62.07
16.	Gift Creator	690,795	+53,875	+7.80
17.	Minigolf Party	825,200	+53,093	+6.43
18.	BlingTown	209,089	+48,331	+23.12
19.	Doodle On Your Friends	166,138	+47,831	+28.79
20.	COLLAPSE!	377,941	+46,404	+12.28

To be clear, before we get started, this list is based on the Facebook applications that grew the most in the past week and now have between 100,000 and 1 million users — this data view lets us see small games that are becoming hits.

At the top we have Ultimate Slot Machines, a gambling-style game from 6 Waves. It made our our overall gainers list on Monday, and continues to do well, having nearly doubled to 889,000 in the past week.

In second place is Playfish’s new poker game, Poker Rivals, which fully launched last week. It has grown from near zero users to 257,000 in this past week.

All in all, the list contains many of the games we saw on last week’s up-and-coming games list, including Ponzi, Inc., The Hierarchy, Top Fish, COLLAPSE! and international titles including 魔力學堂Web,