- 在小型世界中，鈷礦只能在710英尺一下找到 (355格). [370 feet or 185 tiles - pc].
- 在中型世界中，鈷礦只能在1110英尺一下找到 (550格).
- 需要 熔岩鎬 來挖掘.
- Actual Cobalt is a poisonous, magnetic metal (though it is actually a key part of vitamin B12, which is necessary for living beings and has extremely low toxicity). It is named after the Kobold, at that time thought of as a mischievous spirit. Pure cobalt is an element found on the periodic table just after iron, and is actually silver-like in color, however it is never found pure in nature. Its primary historic use was as a pigment used especially in glass or porcelain, as it turns a rich "cobalt blue" when in the compound form of Smaltite, made of cobalt, iron, and nickel combined with Arsenic. This made cobalt, along with lapis lazuli, one of the few mineral blue pigments, and therefore was an extremely valuable commodity.
- Several Cobalt items in the game are Japanese-themed, namely the 鈷剃刀, 鈷盔甲 and the 鈷劍 which resembles a katana.
- Cobalt's inventory sprite is copied by 精金礦, except rotated and red.