"おやじ菌" is a popular game that has taken schools across the country by storm. In this game, you can cultivate and grow a unique type of bacteria called "おやじ菌" that makes you look like a middle-aged man when you touch it. Using empty bottles, you can easily cultivate these bacteria at home.

The game consists of four simple steps. First, you need to multiply the bacteria by leaving them alone in the bottle, but you can also tap the bottle to increase their numbers. Each bottle has a different limit to how many bacteria it can hold. Next, you can collect the bacteria using a syringe. The collected bacteria are automatically sold, and you earn money based on the type and level of the bacteria. You can use the money to level up your bacteria, acquire new types of bacteria, or upgrade your bottles. By leveling up the bacteria, you can increase the amount of money you earn when collecting them.

In addition to the gameplay, there are other features in the game. There is a "Story Meter" that fills up as you progress, allowing you to unlock new stories. You can also revisit previous stories in the "Story" section. Lastly, there is a "Collection Room" where you can learn more about the different types of bacteria you have encountered.

Overall, "おやじ菌 培養ビン 放置育成" is a fun and addictive game that allows you to cultivate and collect unique bacteria. The simple gameplay mechanics and additional features make it an enjoyable experience for players of all ages.