Gas Masks

 were a limited time currency during the Act Two of the Terwilligers 2015 Event. They were earned different ways.
 * By tapping on Bob Clones that appeared on the streets of Player's Springfield.
 * By tapping on Bob Clones that appeared on their Neighbors' Springfields.
 * By tapping on Mutant Vegetables that appeared on their Neighbors' Springfields.
 * From April 28 to May 6, 2015, before the Level 52 update.
 * Occasionally by catching Mutant Seed that appeared on the player's town.
 * By completing each act's questlines.
 * By completing Cecil's Daily Tasks
 * By completing Random Character Group Tasks triggered in the game, after completion of each act's questlines.
 * By collecting income from the Monsarno Research Campus.

were used to get Act Two prizes.

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