Biological Hourglass is the fourth stage in Lovesick Again.
- Director Kurosawah spawns after 2 seconds.
- Pairs of HaterBaa 2.0s spawn at 13.3400f, 53.31600f and 80 seconds.
- After 3.3 seconds700f, Doge Dark spawns every 16.7 seconds500f, up to 5 can be seen.
- Dark Otter spawns after 60 seconds.
There are a lot of Black Enemies in this stage, so make sure to bring some anti-Black Cats. Weightlifter Cat is definitely recommended, as well as Tin Cat to knockback Director Kurosawah, who is the boss of this stage. Also, bring a Critical Hitter to deal with the HaterBaa 2.0s early on. As long as your meatshields and anti-Black units are leveled up decently, it shouldn't be too hard.