During levels where you collect Lums, note that some groups of them will also have a single purple Lum. Purple Lums are worth two points. After collecting one, the next Lum in the chain will turn purple. If you miss collecting the purple Lum and collect a regular one instead, this chain will end. You may also find a large Lum wearing a crown. Collecting the King Lum will turn all Lums purple for a short duration. When this happens, try to collect as many Lums as possible.