Lenovo and Devpost just launched the Multi-Touch Multi-Hack, a global online hackathon to build interactive Windows apps for Lenovo’s multi-user, multi-touch Aura interface. There are $25,000 in cash prizes, along with promotional placement for the winning apps across Lenovo's platforms.

Using the Windows 8 and 10 SDKs, developers can build apps for the Aura interface that let people use all 10 fingers at once to interact with a desktop or tablet touchscreen. Multiple people can also interact simultaneously on the same Lenovo device — opening up the possibilities for collaborative computing using natural hand gestures.

Coders and interaction designers have until June 14 to build an app with 10-finger touch that creates a new educational or entertainment experience on the Lenovo YOGA Home devices. The grand prize winner gets $10,000 and a meeting with Lenovo's business development team, and all winners receive a Lenovo YOGA PC or tablet and promotion for their apps.

The hackathon judges include VC guru Brad Feld and Matt Presley from music creation platform Open Labs. For more details and registration, go to multitouch.devpost.com.