In Bloons Tower Defense 2, all difficulty levels have a dedicated track. The Medium track is a grassy field similar to the track in Bloons Tower Defense. The player starts with 75 lives and towers and upgrades cost 2% more than their default costs. (In BTD2, none of the difficulty levels use the default costs.)
Bloons Tower Defense 3
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Bloons TD 4
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Bloons TD 5
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Bloons TD 6
In Bloons TD 6, Medium starts on round 1 and ends on round 60 with the BFB. The player starts with 150 lives, towers and upgrades use their default costs (18% more expensive than Easy and 8% cheaper than Hard), and Bloons move 10% faster than on Easy. Getting all Easy and Medium medals on a map unlocks a silver map border.
Modes
Standard — No special rules. Unlocks Military Only and Reverse.
Apopalypse — Rounds are randomized and there are no breaks between rounds. When all Bloons from the last round enter, the next round begins immediately.
Reverse — Bloons spawn from the exits and exit at the entrances, and the order of Bloons within each round is reversed. Unlocks Sandbox.