Building on a 2011 that saw it highlighted as publishing the #1 top grossing iPhone in the US, Pocket Gems is pushing on, with new free-to-play titles on iOS and Android.

Most notable - given that game was Tap Zoo - was the release of Tap Zoo 2: World Tour in December.

Tap happy

Interestingly, Pocket Gem is looking to migrate players across to the sequel, and has since removed the original from the App Store.

Obviously, you can log into the games using the same user name and password, with your existing zoo and account transfered to the new game.

Other games released from iOS since December include Tappily Ever After, Tap Buggies, Tap Zoo: Santa's Quest, Holiday Hotel and the thematically rather different Zombie Takeover.

The company's also started to get active on Android.

Previously, it only had Tap Zoo available (Android's not got the sequel yet), but it added Tap Zoo: Santa's Quest before Christmas, and the fairy tale-inspired Tappily Ever After over the past weekend.