Puffer Planet (Merciless) is an Advent Stage appearing on the 13th, 14th, 27th, and 28th of every month. When clearing this stage, the player has a chance to unlock Mightycat. Unlike other Advent Stages, it is unlocked after clearing Chapter 2 of Cats of the Cosmos.
- Puffsley's Comet spawns as the boss after 20 seconds.
- 4 Star Pengs spawn after 26.7 seconds800f, delay 16.7~20 seconds500~600f.
- 1 Corporal Weyland spawns after 50 seconds.
- 1 Project A spawns after 80 seconds.
- 4 Star Pengs spawn after 100 seconds, delay 13.3~16.7 seconds400~500f.
- 4 Star Pengs spawn after 160 seconds, delay 10~13.3 seconds300~400f.
- 4 Star Pengs spawn after 206.7 seconds6200f, delay 40~50 seconds1200~1500f.
Due to the massive buffs on the Starred Aliens (particularly the Star Pengs), it is highly recommended to have all anti-Starred Alien Treasures before attempting this stage. Missing even one Treasure set will lead to each Star Peng having 672,000 health and 36,000 attack power, making them nigh-unbeatable without certain anti-Alien Uber Rares/Legend Rares.
|ChuckPlayz||NO UBERS, 3 CATS
|Lucas IV||A Rich Cat is used in this video.|
- This stage was altered in version 9.1. Before the update:
- Puffsley's Comet spawned after 10 seconds;
- Project A spawned after 1 minute;
- The first wave of Star Pengs spawned after 3.3 seconds and had a delay of 20-23.3 seconds between each Star Peng;
- The second wave of Star Pengs spawned after 90 seconds and had a delay of 16.7-20 seconds between each Star Peng;
- The third wave of Star Pengs spawned after 163.3 seconds and had a delay of 13.3-6.7 seconds between each Star Peng;
- The final wave of Star Pengs spawned after 223.3 seconds and had a delay of 33.3-40 seconds between each Star Peng.
- This is the only Merciless Advent Stage to award a gold Meow Medal.