actually there is 26 characters to unlock by beating areanas in 1 player and by finishing the game with different characters
Castle crashers!!
honestly i think its outta these 5: castle crashers, tetris, peggle, pokemon, COD 4
Castle Crashers would be the ideal choice there. 4 player side-scrolling Beat 'Em Up.
Click everything in the 2 row, the 2 middle ones in the 3, and everything in the 4
To enter Mordred's castle, solve the door puzzle. Click once on each of the 4 cards in the second row, the two middle cards in the 3rd row, and the 4 cards in the 4th row.
Room Crashers - 2011 was released on: USA: 4 June 2011
House Crashers - 2009 Farmhouse Kitchen 4-1 was released on: USA: 4 April 2011
House Crashers - 2009 Zen Bedroom 4-4 was released on: USA: 2011 USA: 25 April 2011
Yard Crashers - 2008 Pergola Seat Wall 4-4 was released on: USA: 29 April 2010
Bath Crashers - 2010 Basement Bathroom Overhaul 4-4 was released on: USA: 31 October 2011
Bath Crashers - 2010 From Brown to Green 4-5 was released on: USA: 2011
Kitchen Crashers - 2011 The Parrot Kitchen 1-4 was released on: USA: 2011