Gnaar Clicker is a game based on the source code of Cookie Clicker. The goal of the developers was to adapt the Serious Sam universe into a clicker game. The game features hotkeys, such as Shift + S, which opens the in-game shop. Additionally, there is a music player that contains tracks from the Serious Sam series, accessible by clicking on the "Music" tab.

The game offers content from various Serious Sam games, including TFE, TSE, BFE, and NE. It also includes over 30 purchases, various upgrades, and achievements. Players can level up and choose from three different difficulty levels. The interface has been redesigned for a better user experience, and there are more than 200 upgrades available.

The Gnaar Clicker plug-in not only launches the game but also provides a key functionality of saving your progress. Simply copy your save text into the plug-in, press Enter, and it will be saved until you click on the text again. The plug-in also notifies you of any updates.