Managed to beat BTD 1 with only Tack Towers out of spite for that one pop-up which says you can't : r/bloons
Play Bloons TD 1 in Bloons TD 6?! - YouTube
Douglas BTD-1 Destroyer | Luke Stryker | Flickr
Naval Fighters Number Thirty Douglas XSB2D-1 & BTD-1 Destroyer: Bob Kowalski, Steve Ginter, Kowalski, Bob, Ginter, Steve: 9780942612301: Amazon.com: Books
Bloons TD 1! - YouTube
NH 89643 Douglas BTD-1 "Destroyer" (Bu#: 04963)
File:Douglas BTD-1 Destroyer with at NAS Patuxent River on 26 June 1944.jpg - Wikimedia Commons