Gus demands Lu play by the rules. / Lu wants Biba to play only with her at Shell School today. / Lu can't understand why Gus is afraid of the vacuum cleaner. / Lu and Barnaby can't agree on how to play with a cardboard box. / Gus gets upset when he can't finish his rocket the way he'd planned. / Lu has difficulty letting go of her favourite but now-too-small rain boots.