Valve's permanently slashed the price of Portal 2 on Steam from $49.99 to $29.99. If you're yet to play it, now's your chance.
Portal and Portal 2 can now be purchased as a bundle for $34.98.
Portal 2 features mind bending puzzles, great dialogue and plenty of humour. Get it here.
The game, which released back in April, is also available for Xbox 360 and PS3.