MultiVersus

The game was originally released in 2022, but after a quick drop in player numbers the game was taken offline and the earlier period was declared as an open beta, even though it was never advertised as such in that period. The monetisation of the game was changed between the supposed beta period and the re-release of the game in 2024.

The game features many playerable characters most of which must either be unlocked using in-game earned "Fighter points" or using the premium currency "Gleamium". Characters cost 1000 Gleamium each, equally roughly 10 USD. There's currently 24 purchasable characters.
Characters can be earned for free, but this is a time consuming process and you will not be able to unlock all characters, as the currency required is limited.

The game featured 3 "deluxe" editions which reward in-game items. These were only available during the beta and are no longer available for purchase These rewards included exclusive cosmetics such as banners and special effects, but also premium currency bundles, battle passes, and character unlock tokens. The most expensive pack costs roughly $100 USD and includes 30 character unlock tokens, which gives an idea of how many characters they plan to release.

The game features a battle pass. The battle pass features a lot of low tier content such as stickers, consumables, effects, xp boosts, etc. It also contains a handful of skins. It offers both a free and a premium track.

The premium currency "Gleamium" is used to purchase character cosmetics, along with purchasing characters. These cosmetics range from 25 Gleamium (roughly 0.25 USD) for stickers, to 3900 Gleamium for bundles. Individual skins come it at 2000 Gleamium (roughly 20 USD). All bundles come in awkward sizes that do not match store prices at all.
Additionally many cosmetics are available for discounts. A lot of these discounts are tiny, just 5%, saving you just 2 cents on some purchases.
When you earn cosmetics you earn "Prestige points", which can be used to purchase more cosmetics. Some of these are outrageously expensive and would require considerable investment to unlock.

As you play you unlock Perks for your characters, these provide advantages to your character in the form of straight up stat boosts, making your character stronger. These need to be bought using Perk points, which can be earned for free, or accelerated through real money purchases.

Additionally the game offers a campaign mode. In this mode you have a limited number of attempts. If you run out of attempts you can purchase more using the Gleamium premium currency. Purchasing full lives costs 1004 Gleamium, but of course the closest bundle is 1000 Gleanium, forcing you to spend more. This feature was deemed a "bug" by the developers and was later removed.