Starting today until April 28, new subscribers can pick up their first month for just £2 instead of the usual £6.99.
The PlayPack 200 Celebration will offer a sweepstake, with players given an entry for every 200 seconds of a PlayPack game they play, with prizes including tablets and controllers.
Meanwhile, multiplayer events in Homefront and Air Conflicts will be scheduled, pitting players against game developers.
There will also be live interactive streaming broadcasts with OnLive staff, and a Brag Clip event displaying the best and worst videos uploaded by OnLive users.
Titles offered in the PlayPack subscription include Homefront, F.E.A.R. 3, BioShock, Batman: Arkham Asylum, Just Cause 2 and Borderlands.
OnLive, which launched in the UK last year, is a cloud gaming service that provides instant on-demand gaming that can be streamed to multiple devices, including PCs, Macs, tablets and television sets.
It has since launched on Android tablets, Kindle Fire and Xperia Play with full button controls.
> OnLive Desktop puts Windows on Apple's iPad
> OnLive: Impressions of the cloud-gaming service's UK debut
Watch a trailer for OnLive's mobile apps below: