This article contains a list of every documented Boss Bloon Event in Bloons TD 6. Due to technical issues in regards to placing large quantities of wiki templates (info on template limits), the list of events are be split by version number (e.g. Version 27.X). Currently, Bloons TD 6 is at Version 41.X.
- Version 27.X (Weeks 1-12) (Bloonarius debut)
- Version 28.X (Weeks 13-20) (Lych debut)
- Version 29.X (Weeks 21-29)
- Version 30.X (Weeks 30-38)
- Version 31.X (Weeks 39-54) (Vortex debut)
- Version 32.X (Weeks 55-64)
- Version 33.X (Weeks 65-72)
- Version 34.X (Weeks 73-82) (Dreadbloon debut)
- Version 35.X (Weeks 83-89)
- Version 36.X (Weeks 90-98)
- Version 37.X (Weeks 99-105)
- Version 38.X (Weeks 106-116) (Phayze debut)
- Version 39.X (Weeks 117-???)
- Version 40.X (Undocumented)
- Version 41.X (Undocumented)
Unless otherwise specified, the custom rounds will be the following:
For Bloonarius:
- Round 40 - 6 ceramics from 10 seconds to 18 seconds
- Round 60 - 6 MOABs from 10 seconds to 30 seconds
- Round 80 - 6 BFBs from 10 seconds to 30 seconds
- Round 100 - 2 ZOMGs and 3 DDTs at 10 seconds and again at 15 seconds
For Lych:
- Round 40 - 6 ceramics from 10 seconds to 18 seconds
- Round 41 - Normal round 41 with 1 MOAB added at 13.2 seconds
- Round 42 - Normal round 42 with 1 MOAB added at 1.5 seconds
- Round 43 - Normal round 43 with 1 Fortified MOAB added at 5.5 seconds
- Round 44 - Normal round 44 with 2 MOABs added from 9 seconds to 19 seconds
- Round 45 - Normal round 45 with 1 Fortified MOAB added at 5.5 seconds and 1 MOAB added at 27.5 seconds
- Round 46 - Normal round 46 with 1 MOAB added at 3.5 seconds and 1 Fortified MOAB added at 5.5 seconds
- Round 47 - Normal round 47 with 2 Fortified MOABs added from 1 second to 6 seconds
- Round 48 - Normal round 48 with 2 Fortified MOABs added from 10 second to 27 seconds
- Round 60 - 6 MOABs from 10 seconds to 30 seconds
- Round 80 - 6 BFBs from 10 seconds to 30 seconds
- Round 100 - 2 ZOMGs and 3 DDTs at 10 seconds and again at 15, 22, 27, and 34 seconds
For Vortex:
- Round 5 - Normal round 5 with 6 yellows added from 3 seconds to 16 seconds
- Round 12 - All bloons are ranked up 1 layer
- Round 24 - Camo Green is a Camo Yellow, Blues are Pinks
- Round 30 - Normal round 30 with 4 yellows added from 3 seconds to 9 seconds and 5 pinks added from 9 seconds to 15 seconds
- Round 40 - 6 ceramics from 10 seconds to 18 seconds
- Round 41 - Normal round 41 with 60 pinks added from 45 seconds to 46 seconds
- Round 60 - 6 MOABs from 10 seconds to 30 seconds
- Round 80 - 6 BFBs from 10 seconds to 30 seconds
- Round 100 - 2 ZOMGs and 3 DDTs at 10 seconds and again at 15 seconds
For Dreadbloon:
- All Leads and Ceramics become Fortified
- All Zebras are replaced with Leads
- All Rainbows are replaced with Ceramics
- Rounds 40+: Every other regular MOAB that spawns is fortified.
- Rounds 70+: Every regular MOAB that spawns is fortified.
- Round 39: 18 regular Rainbows → 12 Fortified Leads followed by 6 Ceramics
- Round 40: Round replaced with 10 Fortified Leads (3-9s) and 8 Fortified Ceramics (14-19s)
- Round 43: 10 Rainbows → 10 Fortified Leads
- Round 46: Round replaced w/ 1 Fortified MOAB
- Round 48: 40 Rainbows & 3 Fortified Ceramics → 20 Fortified Ceramics instead
- Round 49: First 10 Rainbows → 10 Regrow Fortified Leads
- Round 60: Round replaced with 3 Fortified MOABs (0-20s) sent w/ a constant stream of 40 Fortified Leads (split into two groups of 20 spawning from 1-9s and 11-19s)
- Round 80: Same as round 75 (1 BFB, followed by 14 Leads, then 1 fortified MOAB and 3 BFBs, then 14 Fortified Leads, followed by 2 fortified MOABs and 3 BFBs.)
For Phayze:
- TBA