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Royal Recognition Badge isnt hard but its hard for me in past its wasnt hard to get this bage but now its harder.....
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The only near impossible levels for me were level 4 & 14 heroic challenges. Level 4 you can breeze your way through by only using genies to fend off enemies from the left path and building archer towers that are only upgraded to crossbow forts which is the quickest possible due to limit on the upgrade level. 14 is where the mage towers really helped. I started with archmage tower with tornado which saved me from losing the level too easily and planted a few dwaarp bomb towers to deal with sneaky invisible enemies and had these towers close to the middle of the screen to easily reach and slaughter enemies. You will go through a painful trial and error like I did, but it is possible to beat heroic 14 this way. Everything else is a cakewalk. Everything mentioned does involve that every skill upgrade in the level select screen was bought. I even relied on hero Cronan to stomp and stun enemies the whole time when available.
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there are four games of kingdom rush, but just the first two are in flash (like here). the others are mobile and maybe steam
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This hard badge should be impossible instead, mainly because of how time consuming it is. Also the no fast forward button is mind boggling.