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If anyone is still struggling with the Hard badge, I highly recommend this walkthrough:
https://www.youtube.com/watch?v=ToJR-w-qEtM
You have to follow it to the letter until the mid-40's (which will require lots of saving and restarting), and then you can either continue to follow the walkthrough (I don't recommend that), or wait until he goes to sell the first Ice Tower. Instead of selling it so you can upgrade the Boomerang, instead wait a bit into the round to upgrade the boomerang. The money you save allows you to get out an upgraded banana factory even quicker. By the mid-60's I was spitting out a new Research Facility every round and have more defense than I knew what to do with.
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In answer to haloreach486 - I believe that the second track used to be the Tap Track (the one shaped like a water faucet). (They have added, and it looks like also subtracted tracks, since the badges were made. I am not sure that they still have the first of the two tracks needed for the hard badge, unless it is the Stream Track; I can't remember.) I hope this information helps.
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The game heavily lags once the balloons come so fast that they end up stacking. This makes the game unplayable and rather annoying.
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I've gotten to round 40 several times and the game keeps freezing just the balloons. My airplane keeps flying/firing and my spike factories keep pumping out spikes, but the balloons with the shell freeze and won't move or take damage.
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This game is just so much fun. Sometimes, I feel like playing the battle game against other players, but here, I can hone my skills and play for real.
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Game is hard on this crappy work PC. every time i click it freezes. In any case if it's as smooth as it plays in these youtube videos its a piece of cake. Establish a solid 3 tower defense to open and sparing use of monkey glue on yellows and pinks while you hoard up to buy your first banana farm at round10 or 11 and focus on upgrading them as well as establishing others to carry you late game when the round rewards are simply not enough to get the necessary final forms for your towers. You must also know the waves that hit you hard, like the first iron balloon wave, the mass camo balloon wave, the mass rainbow wave, ceramic wave and your first moab wave. Invest in the necessary final form towers to combat those respective 'doom' waves right before they hit. It's possible to win on hard with 4 farms on their second to last form as long as you don't lag as hard as i do and can grease the lanes liberally.