Bloons Tower Defense 5 Unblocked At School No Flash Exclusive Fixed -
The Ultimate Guide to Playing Bloons Tower Defense 5 at School: No Flash, No Limits
The "Camo/Lead" Wall
HTML5 Rewrites: Some sites have converted the original BTD5 mechanics into JavaScript/HTML5, though these are often unofficial, buggy recreations.
Ninja Kiwi's Official Port: The definitive "no flash" solution is Ninja Kiwi's standalone launcher or the Steam version of BTD5. However, these require installation, which is typically impossible on school-managed computers without admin rights.
Ruffle Emulation: Some unblocked sites embed an open-source Flash emulator called Ruffle, allowing the original .swf file to run without the Flash plugin. This is the closest to a "no flash exclusive" experience.