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Gold Award-winning freight-based puzzler RGB Express has had its price slashed down to the painfully tempting nothing at all. So if you've been on the fence about this one, now's the perfect time to give it a bash.

The game sees you drawing lines around road networks to send your trucks out to collect and drop off deliveries. The lines can't cross, and you need to make sure the right colour boxes go in the right colour trucks.

At review we called the game "a jolly, entertaining, sweet-natured puzzler that starts off simple but will smash your brains out with a (coloured) box later on."

If that sounds like the sort of thing you'd like to get for free, head on over to the App Store right now and grab RGB Express while it's still on sale. Or wait a bit and pay, if you're feeling nice.