Fossil Slide

“Educational 2D merge game about the history of life: slide a row of a 5x5 grid sideways to line up three identical creatures, which merge into the next tier in fossil-record order with rough dates — bacteria (3.5 bn yrs ago), sponges, jellyfish, trilobites, fish (~518 m), amphibians, reptiles, mammals (~225 m), birds, primates, humans (300,000 yrs). Each tier shows a true fact. Never imply one group became the next; accurate science only.”