OS Graveyard

OS Graveyard is the fourth stage in IT Catacombs.
==Battleground==
*1 Professor A. spawns as the boss after 0.07 seconds2f.
*1 Teacher Bun Bun spawns after 33.33 seconds1,000f.
*1 Bun Bun Black spawns after 26.67 seconds800f.
==Strategies==
Money will be your main concern, so don't bother getting loaded with Uber Rares. Instead, use Cat Combos to help with money, and use cheap units.
===Strategy 1===
Upgrade your Worker Cat to 2, then spawn a Roe Cat. It can hold off Professor A. until Bun Bun Black spawns. By then, you will have enough cash for a Hacker/Cyberpunk Cat. Have Bun Bun Black kill the Roe Cat, then spawn Hacker/Cyberpunk Cat, your 3 cheap meatshields and Bombercat.
As soon as Bun Bun Black is perma-frozen, stop spawning Bombercat. Hacker/Cyberpunk should be doing damage to the Professor A.
When money allows, spawn in some Roe Cats for defense against Professor A. In the situation when Prof. A kills your Bombercats, just repeat the process. Eventually, Prof. A will die, and Teacher Bun Bun will come out. There, spam Necro-Dancers to permafreeze them.
Congrats, you should be able to either kill both and progress, or completely destroy the enemy base.
===Strategy 2 (1-3 Crowns)===
Similar to the first strategy above, albeit with a more reliable attacker. Upgrade your Worker Cat to level 2, spawn a Roe Cat, wait for Bun Bun Black to get close, then freeze it with Bombercat. Spawn Roe again to take hits from Professor A, then start stacking Golfer Cats. If Bun Bun Black gets knocked back, repeat from the step where you lure Bun Bun Black.
Once Professor A. is dead, stop spawning Golfers and Roe, and start spamming your other units to finish off the Bun Buns, then you have won.
===Strategy 3 (4 Crowns)===
Try to stall Professor A. in the beginning with Li'l Erasers. When Bun Bun Black spawns, meatshield constantly. Wait for him to reach your meatshield line, then spawn a single Bombercat and Grandmaster/Mina/Souma Cat. Then, wait for your Grandmaster/Mina/Souma Cat(s) to snipe Prof A. Use Iron Wall/Breakerblast when Bun Bun Black gets knocked back, and replace Bombercat if he dies. If possible, stack Grandmasters/Minas/Souma Cats. Eventually, the Professor A. should die and Teacher Bun Bun should spawn. Now, start spawning Sanzos and Cameramen. Eventually, the two Bun Buns should die, allowing you to win.
==Trivia==
*OS Graveyard's Japanese name, Tomb of Mrs. Dos, is a reference to MS-DOS (Microsoft Disc Operating System), the main operating system for personal computers throughout the 1980s.
==Reference==
*https://battlecats-db.com/stage/s00040-04.html
Category:Sub-chapter 41 Stages
Category:Stories of Legend Stages