'Numeric Demon Cat' (former name 'Destroy the Demon Army - Modified') is a numerical strategy game with HARD 5-star achievements and competitive leaderboards. There are 3 levels.

Lv.0 Numeric Big Bang

Using limited operations to expand the value. 5-star achievement needs to change 1 to 100 million.

Lv.1 Destroy the Demon Army

Recruit and upgrade your troops and try to eliminate the demon army in the shortest time possible. Boss has 99999999999999999 HP.
This game is an overhauled version of '消灭魔王军 Destroy the demon army' (1006170). The original creators have already given consent for its production and release.

Lv.2 My Lucky Cat

You have a lucky cat at your home. You can cook food, buy and upgrade items. Try to have the most gold possible. 5-star achievement requires 1 million gold.
The second level has a skip function, but note that the leaderboard can only be updated 10 times within 10 minutes.
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FAQ

Q: How do I play this game? Why is there no tutorial?
A1: The developer lacks the skill to create a tutorial, opting for none rather than a poor one.
A2: The developer intentionally made a HARD game with a high barrier to entry, and does not provide a tutorial.