Air Bar
A Blockhead's Oxygen Bar shows how long they can go without air.
Where Located
Immediately underneath the happiness bar beside (and inside) the character status window for the associated Blockhead.
Normally not displayed, the oxygen bar appears only when a Blockhead is underwater or in space. It has a round, blue "bubble" icon beside it.
Decreasing
There are two known conditions that will cause the oxygen bar to decrease: being in space and being under water. This is determined by the location of a Blockhead's head.
While decreasing, the oxygen bar will change from blue to red beginning at the far end from the bubble icon and progressing toward it.
Increasing
The oxygen bar will increase once the associated Blockhead's head is back in breathable air. The progression of red will reverse until the bar is completely blue, at which point the breath bar will vanish.
As of the 1.2 update a Blockhead can refill half of its oxygen bar by eating kelp. This allows it to stay underwater or in space for more time.
Gallery
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A diving Blockhead with Breath Bar visible (1)