Game will not save your progress if you use FireFox < 43 (like latest ESR version, which is only 38)... So either update the browser or wait for next ESR release...
This game got frustrating before it even started: since I didn't have 3rd party cookies allowed for gamejolt.net, I got the level selection but couldn't select any level...
If you want the hard badge I'd recommend going for Drag Strip (rank 45 recommended), Castle is the most difficult (I can't beat it even on medium...), Death Valley looks awful on first sight and Clock is too weird with the invisible and changing path. Plus there are actually working walkthrough videos for Drag Strip (which I couldn't find for the others) :-P
Phew, all levels completed with every vehicle (great game btw), Balloon 20, SAM 5 and 15 plus Zorb 41 and 52 were pretty hardcore ;-) Balloon is my least favorite, not because it's so slow, but because it's so big and there is not enough space for maneuvering in too many levels. TARDIO, Lifter and Classic Choppa are the best, SAM/Jouster are also cool although a bit problematic on some levels.
Ok, so I got 12x platinum (extra tools left in parentheses, b = bag, g = gate, m = meat)
Forest: Simple Green (b)
Mountain: Up The Mountain We Go (b), Whelps Have Wings (b+g), Veiled Retreat (g)
Cave: A Cave With Some Chaos (2xb), The Sweet Lure of Meat (b), Uh Oh No Loot Bags (g+m), A Little Help From My Friends (m), Her Royal Highness Kro'La (b)
Catacombs: Someone Must Be Trap Happy (b), The Treasure Chamber (b), The Final Confrontation (b)
Hope it helps :-P
seems I'm #18 to get the hard badge :), but the game is not much fun, controls are not very good especially when jumping and the unskippable 10 second animation in last level is purely annoying when trying to complete time challenge
Last race is totally hardcore, I needed about 30 tries to finally win: by having a good start, using boost to become 1st as soon as possible, blocking the 2nd from overtaking and not making any bigger mistake for 5 laps...
Woooohoooo: Congratulations! You just won the Assassin's Greed Badge and 60 points!
It was not that impossible, just needed to spend mostly 10-15 minutes to finally get a lucky constellation. And the most difficult (and last) ultimate badge for me was no professional, but hard #29...
Chepest and easiest (guaranteed if you have Bag of Crystals) way to win any battle:
Pick 6-7x Gold mine, 5x Peasant, 1x Bag of Crystals, 1x Crystal mine, 1x Parting Rift and 1x Chaos Urn or some tougher monster which only costs gold (to get 2 souls needed for Rift). When playing use mines and pick cards, get those 2 souls, after enemy uses his global enchantment replace it with Rift and send your 100 peasants to death in small groups... Might be possible to win this way without Bag and with more Crystal Mines, but I'm too lazy to try :-P
Great game, altough I got all the upgrades quite soon (more upgrades would be awesome) and the boss was too easy :P. Oh and btw you only need a combo multiplier of about 70 for the hard badge.
Why can't I quit battle to menu? Am I missing something or do I always have to reload page and load 22+MB game again? Because when the battle is clearly lost (without possibility to run) and it would take too long to just die, there's no point in wasting time...
Did you know you can permanently change element of a hero? Just put 2 element switching items in his inventory and play a quest, after you finish and remove both items, element of first one will stay (other than the one which is used during the quest). Found out by accident :-)