Rush hour traffic is less frustrating than this! The puzzle is skilfully tilted from side to side, with the aim of persuading the coloured spots to float into the correct positions on each of the four traffic lights. Doing one isn't too difficult, but the good work is undone in the attempt to dislodge any spots that have ended up in the wrong place. You'll fritter away hours on this
- the prominent 'stop' sign in the picture is quite opportune!