When worn, the player is able to see in the dark with a sort of negative filter. If the player wears the Moggles when there is light outside, their surroundings appear extremely bright. Unlike other light items, Moggles allow the player to see everything on the screen.
Moggles will last for one and a half days in total but can be recharged using Glow Berries, which will restore their durability by 33.25% (almost 4 minutes), or Lesser Glow Berries, which will restore their durability by 6.25% (45 seconds).
Despite not being a light source in the conventional sense, wearing Moggles will protect players from Charlie.
In the Shipwrecked DLC, Moggles cannot be crafted but can be brought over from a connected Reign of Giants world. In Shipwrecked, they can be refueled with Dragoon Hearts, restoring 33.25% of their durability similar to Glow Berries.
- Moggles are the only portable means of acquiring 100% visibility at night or underground.
- Moggles can be particularly useful when dealing with Cave Spiders and Spitters.
- They are especially handy when exploring the Ruins since the player is able to spot danger and prepare for the lying monsters in wait.
- Moggles will be destroyed if they reach 0% so the player should make sure to un-equip or refuel them before this happens.
- Briefly equipping Moggles will instantly kill any nearby Night Hands.
- As with any other fuel, only 75% of the item's normal fuel value is added if the Glow Berries/Dragoon Hearts are wet. If these items are scarce, player should take care to let them dry before refueling the Moggles.
- Since the glowberries needed to refuel them also cost 20 Oincs at the 'The Sty' Oddities Emporium and only refuel about a third of the durability, it is recommended to simply buy a new pair of moggles when they run out.
- Upon release, the recipe for Moggles was 2 Moleworms, 2 Electrical Doodads, and 4 Silk. It could be repaired with a Sewing Kit instead of needing to be refueled.
- Hovering over objects that can be examined or standing under a shaft of light in Caves while using the Moggles will make the objects appear in black and white.
- The word "Moggles" is a portmanteau of the words "Mole" and "Goggles".
- Wickerbottom's quote is clearly about the original design of the moggles, as the original design appeared to have moleworm noses over the wearer's eyes.
- Players wearing Moggles are able to see other players being attacked by Charlie. It appears as though a hand pulls itself through their mouth as darkness swarms them briefly.
- Occasionally, the Moggles will not work underground. This can usually be fixed by exiting and re-entering the level they have ceased to function in.
- While equipping Moggles, the entire screen is considered illuminated by a light source. As a result, Spiders will panic while on screen.