Change your player rank to access high-level content like Mastery Mode.

While BTD5 is primarily a single-player or cooperative game, using save editors carries specific risks:

Editing save files carries a risk of corrupting the data, causing you to lose all progress. Additionally, if you are playing the Steam version with Leaderboards or Achievements enabled, modifying save data can flag your account or invalidate leaderboard entries.

suggests that while save editors are generally safe to use for single-player progression, they carry risks: Corruption

Before you can use an editor, you need to locate your local save data. The path varies by platform: Where I can find the Bloons TD 5 Deluxe save file? - Arqade

Btd5 Save Editor -

Change your player rank to access high-level content like Mastery Mode.

While BTD5 is primarily a single-player or cooperative game, using save editors carries specific risks: btd5 save editor

suggests that while save editors are generally safe to use for single-player progression, they carry risks: Corruption btd5 save editor

Before you can use an editor, you need to locate your local save data. The path varies by platform: Where I can find the Bloons TD 5 Deluxe save file? - Arqade