Advent of Code 2021 day 11 felt a little bit like a repeat of Day 9. In both cases, we got a 2-dimensional map with single digit values. In case of day 9 it was a height map, this time round we’ve got a 10x10 grid of bioluminescent Octopi. Each of those critters has an energy level that increases each round. Once that level goes past 9, it lets off a flash, which then imparts extra energy into the surrounding 8-legged creatures.
