Tentacles: Enter the Mind
20 Achievements
200
6-8h
Black Magic
You cracked a black egg!
10
How to unlock the Black Magic achievement in Tentacles: Enter the Mind - Definitive Guide
EDIT: I forgot to mention these are generally found in the later stages of the game. You should notice a progression in the color of the eggs and hammers you collect as you go.
mDoolin14 adds that if you use the buffs that help you find eggs or hammers (you can find them in the store periodically for small amounts of coins), you might have an easier time getting one.
Black eggs can start appearing around the 11th layer, Regret. It is also possible to find a black hammer in the levels but it is extremely rare. As with the purple egg, the spawn rate will increase as you progress in the game. If you don't want to wait for a black hammer to appear in the levels you can buy it from the shop in about 2-5 pit stops or deaths. In the store the hammer costs 50,000 coins to buy. It is possible to still find black eggs in the last layer of the game so don't worry if you don't find the egg right away.
Black eggs can start appearing around the 11th layer, Regret. It is also possible to find a black hammer in the levels but it is extremely rare. As with the purple egg, the spawn rate will increase as you progress in the game. If you don't want to wait for a black hammer to appear in the levels you can buy it from the shop in about two to five pit stops or deaths. In the store the hammer costs 50,000 coins to buy. It is possible to still find black eggs in the last layer of the game so don't worry if you don't find the egg right away.