Topple is also a game developed and published by ngmoco

Ngmoco

ngmoco, Inc. is an American-based publisher of video games for the iOS and Android platforms, and a subsidiary of DeNA. The company was founded by former Electronic Arts executive Neil Young in July 2008. Since its founding, ngmoco has had more than seven million combined game installs...

 for the iOS platform. It is available for download on the iPhone

IPhone

The iPhone is a line of Internet and multimedia-enabled smartphones marketed by Apple Inc. The first iPhone was unveiled by Steve Jobs, then CEO of Apple, on January 9, 2007, and released on June 29, 2007...

 and iPod touch

IPod touch

The iPod Touch is a portable media player, personal digital assistant, handheld game console, and Wi-Fi mobile device designed and marketed by Apple Inc. The iPod Touch adds the multi-touch graphical user interface to the iPod line...

 on the App Store or iTunes

ITunes

iTunes is a media player computer program, used for playing, downloading, and organizing digital music and video files on desktop computers. It can also manage contents on iPod, iPhone, iPod Touch and iPad....

.

Gameplay

In Topple players have to complete levels by stacking different shaped blocks vertically to reach a set height. Blocks are stacked by being dragged using the players finger and can be rotating by placing 2 fingers on the screen and rotating. The tower can also be kept upright by tilting the device from side to side in the opposite direction to where the tower is leaning. Players lose a level when 4 blocks fall off the side of the screen. There are 9 levels to complete and players are rewarded stars for reaching the bonus height, time and target score. There is also an expert mode, training, free play and space mode. There is also an option to challenge friends via email and also in game achievements.