101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
Gas Mask瓦斯面

Gas Mask is row 52 of the game's guilü table, with the element Fire. The battle screen reads (Shoot Water!): it is weak to Water.
Drop table
After the battle the game rolls a number from 1 to 64 and picks the outcome whose share holds it, then rolls again for the amount. Shellfish Powder and Guilü Balls can be taken from you as well as given.
| Outcome | Chance | Amount |
|---|---|---|
| Nothing | 33/64 | |
| Gives Shellfish Powder | 25/64 | 1 (39/64), 3 (25/64) |
| Gives Guilü Ball | 4/64 | 1 (55/64), 3 (9/64) |
| Gives Men's Extract | 2/64 | 1 (64/64) |
Guilü table: Gong Body Gas Mask Meridian Face
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503