History YMMV / HappyTreeFriendsAdventures

* SoBadItsGood: Another result of the above {{Narm}} factors.

* BrokenBase: Boy, where do we even begin? Most of the casual HTF fans enjoy the series, especially considering that HTF fangames aren't really commonplace and this is one of the most decent ones. Crossover fans even more so, due to the series' nature. The more serious fans usually shake their head at the ridiculous concept, but other parts of the fanbase outright hate it for many reasons ({{CrossOver}}/MegaCrossOver, inclusion of [[OriginalCharacter fan characters]], etc.). Non-HTF fans, especially fans of the video games featured in the series, either accept it as SoOkayItsAverage, facepalm at the concept, end up being simply confused at what the series is trying to do, or hate it with a passion.

* ViewerGenderConfusion: Flaky, obviously. Even before WordOfGod from Mondo, Radel999 clearly stated that Flaky is a girl. And he was correct about that.

*** Likewise, in most games, due to collision problems, it's possible for enemies to get stuck, rendering them mostly harmless (due to CollisionDamage) and giving you a free kill.

** Spike Koopa's level in HTFA 6. Bottomless pits, spikes, and tricky platforming abound. This being the first choice in the beginning part of the game (this covers one-third part of the game; like the [[Franchise/MegaMan Mega Man]] series, you can do those levels in any order) can throw off some players. You might find yourself dying often while trying to platform through. Not like the other levels are any easier. Some players consider HTFA 6 to be the most difficult (near-stable) HTFA game, and it shows. As for the boss battle itself, it is easy, but wastes a lot of time due to his attacking pattern.

** From the same game, Koopa Muscler can be considered this too. These things are bigger than common enemies and their only attack is [[GoombaStomp jumping to crush]] the player. Their size makes it difficult to go past them, so having them jump is the only way to do so. The problem is that they actively follow the player, they take multiple hits before being destroyed, and there can be more than one on-screen. It's best to simply run past them and take few hits instead of trying to get rid of them, take multiple hits, and waste your time.

* BreatherBoss
** In HTFA 5, for a boss in the penultimate kingdom, Wart is incredibly easy to defeat.

** In HTFA 4, the second level, Lemmy's Crazy Fortress, can be this to some. For an early level, it already shows some signs of tricky platforming. On the other hand, there's a [[LiftOfDoom elevator section that goes down really slowly as the platform you're on passes through numerous hazards and you have to navigate on your own as well to avoid either getting crushed by the top part of the screen or getting hit by hazards]]. While the somewhat tricky platforming parts can be done if you're careful enough, the elevator part is criticized for making the level feel boring. As for the boss battle? Lemmy can either be ThatOneBoss or an extremely easy one depending on how you actually fight against him.

** In HTFA Land, ''Bowser'' himself. You may be thinking "Oh, come on. He's the final boss. He's supposed to be difficult yet fun." But... I'd rather say otherwise. First of all, Bowser has two phases, with the second one being obviously insane. After a ''[[VideoGame/SuperMarioBros1 Super Mario Bros.]]''-esque boss fight in the first phase, Bowser [[OneWingedAngel grows gigantic]] [[MakeMyMonsterGrow thanks to Kamek]]. During this second phase, you have to [[AttackItsWeakPoint shoot his head]] to damage him. However, because of his size, you have no choice but to use the springboards (even if you've picked Flaky, as the Special Power gauge would eventually run out before you defeat the gigantic Bowser). And... it's easier said than done. Bowser constantly moves and attacks, distracting you as you have to focus on dodging the many projectiles he shot. You can make the fight somewhat easier by jumping over him and trying to shoot him from the back, but you have to be closer, as the head cannot be damaged if it's off-screen. That's not the worst part, however. It's the fact that despite the more polished game engine, it STILL managed to ruin the fun by [[GameBreakingBug having Bowser hop off-screen due to a glitch]] (and this is not one of the rarer instances in the series either), forcing you a reset... but wait, this is HTFA Land we're talking about, which is infamous for being extremely buggy when it comes to game saves (well... this is the first HTFA game to have {{Autosave}}, so it might be understandable, but still...). If luck isn't on your side, good luck ''restarting the game over'' just to reach your lost progress again!

** In HTFA 6, the third level of Bowser's fortress features one vertical section where you have to dodge lasers that deal three hit points of damage (keep in mind that you have 8 hit points at maximum in this game). You have to move ''fast'', as the lasers are shot quite quickly, and there are numerous of them as you climb down this section. There are health items scattered around, but there aren't many of them and aren't enough to save you. Not even MercyInvincibility can help either if you're not quick enough or often getting stuck, slowing down your progress and quickening your death. Going into this level as Petunia, the fastest runner, is recommended. However, once you've gotten past this section, you only have one more section left before ThatOneBoss...

* CrackPairing/[[CrossoverShip Crossover Ship]]: Radel999 once paired Flaky with ''Bowser'' in a single artwork. Yes, the man went there. Doubles as a BigLippedAlligatorMoment for his Website/DeviantArt gallery as the pairing is never mentioned again.

** In HTFA 6, the third level of Bowser's fortress features one vertical section where you have to dodge lasers that deal three hit points of damage (keep in mind that you have 8 hit points at maximum in this game). You have to move ''fast'', as the lasers are shot quite quickly, and there are numerous of them as you climb down this section. There are health items scattered around, but there aren't many of them and aren't enough to save you. Not even MercyInvincibility can help either if you're not quick enough or often getting stuck, slowing down your progress and quickening your death. Going into this level as Petunia, the fastest runner, is recommended. However, once you've gotten past this section, the only problem left in this level is ThatOneBoss...

** Spike Koopa's level in HTFA 6. Bottomless pits, spikes, and tricky platforming abound. This being the first choice in the beginning part of the game (this covers one-third part of the game; like the [[Franchise/MegaMan Mega Man]] series, you can do those levels in any order) can throw off some players. You might find yourself dying often while trying to platform through. Not like the other levels are any easier. Some players consider HTFA 6 to be the most difficult (near-stable) HTFA game, and it shows. As for the boss battle itself, it is easy, but wastes a lot of time due to his attacking pattern.

* SnarkBait: Nonsensical crossover? Check. Broken English? Check. Aside from a few bloody and gory deaths, basically WebAnimation/HappyTreeFriends InNameOnly? Checkity-check. Seriously, with those factors, try mentioning that to the more mature fans of any of the franchise featured in this fangame series (''especially'' to the more serious HTF fans).

** In HTFA Land, you have Crush Crawfish as the boss of the third world. Its attacks are actually easy to dodge. What's the problem? ''The water''. In a certain interval, a large amount of water rises, forcing your character to swim while still dealing with Crush Crawfish's attacks. This can lead to awkward controls, especially when the water drains back after a certain time has passed. If you pick Toothy, the battle against this boss, while still a bit difficult due to the swimming physics, will be more doable. If you pick someone else? Prepare to struggle a lot.

** In HTFA 6, [[spoiler:Mecha Tacho]] is this. Like [[spoiler:Flippy]] and [[spoiler:Mecha Neena]], this particular boss follows you. Despite only walking along the ground like the aforementioned two bosses, he presents more difficulty than those two. First things first, he mainly attacks by shooting fireballs, which are fast. Secondly, he can also fire missiles between (somewhat) random intervals. Thirdly, and the most important factor to the difficulty he caused, is the boss room layout. Both of the two bosses mentioned above have a friendly layout that simply consists of two small platforms on one side each, aside from the flat ground both you and the boss can stand on. They're placed low enough, but are convenient enough for moving from one side to another without [[CollisionDamage colliding with the boss]]. In this boss's case, however, the layout consists of a single floating platform placed high, which can only be reached via either one of the two moving platforms on each side, which move up and down. Using those platforms, in fact, lessens your chance of hitting the boss because, remember, the boss actively follows you and forces you to keep moving. Now, combine that with the boss's attacks, and you have a recipe for frustration.

** HTFA Land also has a BossRush level that ends with you fighting a Boom Boom. Granted he's tougher compared to the previous encounters, but still, he's very easy to take down.

** In HTF Origins, we have the Dragon's flame attacks. Among the usual red hot flames, there are bigger, blue flames that take off two health points from your character if he/she gets hit by those. Combine this with the somewhat poor MercyInvincibility, and you'll die often. It seems as if the extra life placed on the boss room is there to cover up the difficulty.

* BigLippedAlligatorMoment: In the updated HTFA 6, [[spoiler:Izzy]] says "PK Freeze!" as his victory quote for no apparent reason.

* AntiClimaxBoss: The penultimate level in HTFA 5 consists of BossRush where you fight the previous bosses (sans Wart). However, since it's treated as a regular level, you still end the level by fighting a Birdo.

** In HTFA GB, [[VideoGame/MegaManV Hyoey]] appears as a boss in the penultimate level. Damaging it is pretty easy, but its [[SpreadShot shots]] are so fast that it's just useless to try to dodge whenever they're fired. You have to get the timing down in order to keep your character safe, but even then the timing might be screwed often because the boss keeps switching places (and no, it's useless to stand behind it when it's moving to the other side, it's programmed to always face your character), forcing you to do the same as well. Also, keep in mind that even if you've finally gotten the timing down very well, you can only make '''five''' blunders (either from the shots or from CollisionDamage).