Written by David H. Lawson (co-founder of Imagine Software), Ah Diddums is a 1983 action game in which you play as a teddy bear trying to escape from inside a toy box (to comfort his crying baby owner) by arranging coloured blocks into a staircase the top of the screen. This allows him to climb up to the next level. And there are 99 levels in this particular toy box, so his journey is going to be a long one…