Kullors looks so sodding easy at first, too – you just have to click matching-coloured blobs until none are left. But then, a few levels in, you realise that you have an odd number of blobs to click, and that’s where things start to get messy – Kullors asks you to start mixing the blobs up and changing their colours. By the end of it, you’re planning how to mix colours about five or six moves in advance and that, friends, is where madness lies. OK, not actual madness, but a jolly nasty headache.

Play Kullors now