If you own an Xbox 360 then you really don’t have any excuse now for never having played Valve’s glorious, sprawling and at times simply awe-inspiring Half Life 2 now.

If you have yet to experience the orangeness of Valve's shooter then fear not. A demo of Half-Life 2: Episode Two is set to appear on Xbox Live Marketplace later today, according to Valve.

SPOnG will be sure to check that this, the first of a number of planned demos from the recently released Orange Box, the best value game release of all time (FACT!) is up by lunchtime.

Orange Box contains all three Half-Life 2 instalments as well as Team Fortress 2 and Portal. In any normal world it should really cost you around £123.54 (expertly calculated by Adam in terms of multiplying the average score out of ten by the number of man-hours of pure entertainment it provides by Adam’s mysterious ‘G-factor’).

If you own an Xbox 360 or a PC then buy this immediately. If you own a PS3 then put some money aside and buy it on December 14. Simple.