Gacha games are named after gachapon vending machines, which entice players to spend in-game money to receive a random in-game item/weapon/character. They are not only cosmetics, but can add something useful to your adventure or improve your gameplay.
These games play on collecting rewards, often inducing FOMO on players because related to time-limited events.
The access to the "pulling" mechanic is usually connected to an in-game currency/material that builds up over time, so it can be obtained for free. The idea is that you receive a chance to pull after spending many hours farming the currency doing daily and repetitive quests, or you can spend real money in order to bypass the grind.
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This kind of games are designed to be addictive, but are totally playable in a free2play way, if you have patience.
Other features present in gacha games are:
- Banners: instead of one giant pool of items, there are limited-time storefronts that feature a specific reward with an increased drop rate
- Pity system: it guarantees that after a certain number of unsuccessful "pulls", the game will automatically grant you a high-rarity reward
- Power creep: the gradual introduction of new characters or weapons that are slightly stronger than the previous ones, this is meant to keep players spending on new banners