Main thread here.
We've got few more preliminaries to go before we can get to the main event and this, for me, is the toughest head-to-head. I love both Portal and Portal 2 very dearly and would include both of them in bracket if I could. Portal was the dark horse of The Orange Box and instantly established itself as a classic with its mix of witty humour and inventive puzzles. Portal 2 proved a worthy follow-up to a game which didn't necessarily lend itself to a sequel by expanding the scope of Aperture and introducing new, hilarious characters to supplement GlaDOS. Get your votes in by 8am GMT/midnight PST when this poll closes.