Day 6/12 of my Christmas Number Evolutions! Evolve to the next triangle numberblock, or the next numberblock that's a member of the step squad. Starts out with 1, 3, 6, 10, 15, 21, 28, 36, and so forth. Credit to Arifmetix for the instrumentals! Credit to Blue Zoo Company for Numberblocks! © Numberblocks
