The Bloontonium Lab is a track in Bloons Tower Defense 5 added on April 4th, 2012. It's difficulty is extreme, making it the hardest track in Bloons Tower Defense 5 . This is the first track to be extreme difficulty, and few can beat it without Premiums or Special Agents. You must have Rank of 60 or higher to play it. Be careful how you play, there are high stakes! Each attempt costs you $50 in precious Monkey Money, mistakes are VERY unforgiving. Also, there are no saves! A sucessful attempt gives high XP and many Awesome Points.
The Triangle of Insanity is considerably hard as the Bloons only move around the outside, and that makes the track extremely short.
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999 B.F.B's appear on Round 250, the "unofficial" last round of BTD4. It is possible to finish...