The cloud gaming service, which launched in the US last year, provides instant on-demand gaming that can be streamed to multiple devices, including PC, Macs and television sets.
For a limited period, first-time OnLive purchasers in the UK can buy their first OnLive PlayPass game, including Deus Ex: Human Revolution and Warhammer 40,000: Space Marine, for just £1.
A PlayPack subscription is also available for £6.99, which provides open access to over 100 titles.
Launch partner BT will offer its customers three months' free access to the PlayPack subscription from day one.
Elsewhere, Eurogamer Expo attendees this weekend will receive a free OnLive Game System, a set-top box for television sets worth £69.99, where stocks last.
OnLive renders all hardware processing usually handled by a local console or PC on a server, allowing games to be available instantly on a variety of platforms.
OnLive currently offers over 150 titles, including DiRT 3, Homefront, F.E.A.R. 3, Assassin's Creed: Brotherhood, Virtua Tennis, World of Goo and LEGO Harry Potter: Years 1-4, with many titles offering free demos and timed rentals.
Full social networking functionality is available, including friend lists, group chat, ten-second video sharing across Facebook and OnLive, Achievements, and game progress saved in the cloud.
OnLive also offers Massive Spectating, where live streams of all players can be viewed and commentated upon.
Future titles coming to the service include Batman: Arkham City, Saints Row: The Third and Football Manager 2012.
OnLive games will be playable in full on iPad and Android tablets by the end of the year.
> OnLive UK launch: GAME, BT Broadband in strategic partnership
> Onlive UK launch line-up, upcoming releases unveiled
OnLive costs in full:
- First-game purchase cost: £1 (usually around £39.99, limited time only)
- OnLive Game System: £69.99 (includes streaming set-top box, controller)
- PlayPack subscription: £6.99 (monthly, provides access to 100 games)
- Account registration and use: Free