Metal Slug 3 | Steam | £2.03
Everyone should own at least one Metal Slug game, and for £2 there's never been a better excuse. Plus, unlike most of the games you're buying on Steam this weekend, it's short enough for you to actually finish. Metal Slug has long been regarded as the king of old school side-scrolling shooters and feels as fun today as it did all those years ago. Fingers crossed we'll see some new material soon though.