I am not even joking about this as well.
Triforce Heroes at least rivals AoL in unforgivability, challenge, and dexterity needed to beat the game.
People may think that the controls are simple, in which they are. Practically anyone can pick up and play this game, which is a good thing in this case. Instead of depth in controls, there is depth to the game itself. It is easy to learn, but hard to master. The puzzles are extremely good, yet the puzzles hardly aren't the most challenging thing about this game. The combat and hazards in this game are the real killer. First off, you only are allowed 8 hearts together(normally) throughout the entire game. This completely eliminates the backwards difficulty scaling found in almost every Zelda game. For the later levels, your team needs to be well oiled and needs to work together well. Many hazards can take out 3 people at once, and those hearts decrease very quickly. Each attack or hazard at least does 1 heart of damage as well, increasing the difficulty even more.
I have not even gotten to what is effectively 3/4 of the game. Challenges. These challenges can involve doing a speed run of a certain level, or carrying a sphere around, or even both. There are levels where you take twice the amount of damage, and deal 1/2 of damage. These are very difficulty because it effectively gives your team 4 hits. And like I said, there are hazards and enemies that target all three players and they could very well hit all three easily. There is a mode where you need to avoid a wallmaster, and if you get hit. You automatically die. So your team needs to keep moving no matter what.
Single Player is also even more difficult still. You need to plan each action you take, especially in the speed run levels in challenge mode. You need to run yourself as a machine, memorize the level, and not hesitate for a second. Bosses get even more hard, and you need a great plan to beat it. Single Player is essentially the "hard" mode on an already hard game with a fore-mentioned challenge mode.
Too sum up. If you think Zelda games have been way too easy as of late, this is a Zelda game for you. As a Zelda veteran who has beaten every single Zelda game, I can attest that this game will be challenging for you and your teammates.