Absurdly High Level Cap: Nothing is really capped, other than by the limitations of integer storage. Late in the game, it's quite easy to acquire 10^80 or so HP and sword power, which is numerous zeros beyond the point at which most of the game's enemies become laughably harmless.
Averted in the Hard Mode. Your maximum health doesn't increase at all, and your sword can only get up to 5 levels maximum.
ASCII Art: It's the most that the game gets, graphics-wise, yet it does not hamper the premise.
Anti-Frustration Feature: In Hard Mode where your health is capped at 100, the Developer's Computer quest removes the four most difficult/painful Bugs (Fireball, Dragon, Demon, and Devil)
Anti-Poop Socking : You need candy to get through the game, and the only way to get candy is simply to wait. You'll have to leave the window open in another tab and just ignore it for a while to build the resources needed to progress.
Attack! Attack! Attack!: Your questing avatar utterly refuses to stop running forwards and beating on things. The only way to manually stop moving is to plant a tree in his path, forcing him to stop and hack away at it for a while.
The Beastmaster: One of the possible classes for the PC, if you choose the summoning sword.
Degraded Boss: In a sense. In Normal Mode, some of the Bugs in the Developer's Computer may have the same attacks as those of the Dragon and Devil.
From the sequel: "Some spikes killed you with its spikes."
Difficulty Spike: The peaceful forest and Goblin Mountain are both fairly easy and pretty doable, even if you've been hoarding/spending all your candy. The underwater cavern, however, is much more challenging, and the Castle Entrance will stop you in your tracks if you're not prepared.
The Castle Keep is another one. Lots of painful Mooks, and the Dragon at the end which requires you to have invulnerability potions and a very good strategy if you want to beat it.
Another one occurs after beating the Castle Keep. You end up in hell and fight demons as regular Mooks... who do as much damage as the Dragon, spiked walls that take a long time to break and deal lots of damage, and the Devil himself who does twice as much damage as the dragon!
Easy Level Trick: The Cow Level in Hard Mode, where your HP is capped at 100. Use an Earthquake Scroll to render the regular cows to 0 HP (but still alive), which allows you to kill them without taking any damage. A potion during the Cow King fight helps too.
You don't have to pay all those lollipops to overcome yourself. You just need to use a Fire Scroll when your foe's health is below 35, which defeats him without having you take any extra damage.
Escape Rope: The Escape Potion will let you leave a quest with no cooldown period, but you don't get to keep your items. The Get Me Out Of Here potion transports you to a different location out of your current quest, which is usually much safer.
Level Ate: Considering that the world's currencies are all candy, lollipops literally grow on trees, and the most powerful swords are made of chocolate, we can make some assumptions—even if the graphics are all ASCII.
Lost Forever: The three upgraded sword types (life-gain, fire, and summoning) are all mutually exclusive; you can only choose one per playthrough. Until you reach the hacking stage, that is, where you can randomize your sword or acquire the Sword of Liflamesummoning.
Luck-Based Mission: You can only beat the final boss by pressing a specific, random key on your keyboard while fighting him. All you can do is use an invincibility potion and mash keys like crazy hoping you hit the right one. Getting past his minions also requires a lot of luck.
Opening the Sandbox: Once the Candy Merchant arrives and you buy your first sword, things start opening up to you. And they keep on opening wider and wider. By the end, No Fourth Wall is taken to its ultimate extreme; you can modify or randomize every variable in the game.
Hell itself is like this. The first wave where you face off a massive rush of very painful demons is very tough. The last two waves are much easier as they contain ghosts that cannot hurt a summoned imp. Then you get to the Devil...
The Developer is hinted to be a My Little Pony fan, with a number of references to ponies in the game (Wood Pony, a Pony Bug, the fake tab bug spawning "Pony" and "mlp is great" tabs).
Stock Puzzle: The frog in the swamp spews out a few stock riddles.
Tastes Like Purple: The lollipops the Candy Merchant sells. Some of them are ordinary flavors like cherry and grape, but some of them are abstract flavors like "causality" and "love."
Too Awesome to Use: You only get a limited amount of Berserk Potions (from the frog, and from the Wishing Well if you so choose) and you are not able to create any more.
Subverted with the Chocolate Bar. You only get one before the post-game, and its one and only use is to coat your sword in chocolate.
Turtle Power: You can brew a potion that turns you into a turtle. This makes you have much more defense, but makes you slower. Being slow will benefit you in getting across the Developer's moat.
Wake-Up Call Boss: The Whale. You face it after a level that wears down most of your health, and its 100 HP and 8 damage is nothing to laugh at when you first face it. Use a Fire Scroll to make things easier.
The Dragon would be this for those who found the whale moderate- if you want to win, you'll need three types of consumables (at least 4-5 of each), and two of them must be created by the player.
World Tree: Mentioned in the recipe for the Seed. A giant, unnamed tree that exists somewhere in the universe which provides infinite candies. There's also a rare chance that you summon a 10000 HP Yggdrasil when planting a Seed.
Your Money Is No Good Here: The sorceress who lives in the forest only accepts lollipops as payment. Vast quantities of lollipops.
The sequel contains examples of:
Airborne Mook: The desert birds that fly high above you. You can actually kill them and get their feathers
Anti-Magic: The "Erase Magic" spell, which erases all enemy magic spells on the screen.
Attack! Attack! Attack!: Averted this time around: once you get the Boots of Introspection, you can actually stand still! Enemies, however, continue to play this straight.
Bat out of Hell: Well, technically a bat in Hell. The Mayan bat god Camazotz will harass you by dropping tons of minions on you as you fight the Devil.
Bullet Hell: After traveling quite a distance Under the Sea, you soon face sharks and sea serpents, the latter of which spray multitudes of painful bullets forwards. This trope comes into play as you progress further and they become more common, eventually having multiple serpents on the screen.
There's also the fight against the Devil where he spams painful sprays of fireballs.
But Thou Must: You have to attempt every possible means of opening the candy box, none of which work, before the game lets you give up and put it in your inventory.
Call Back: The rats in the cellar are shown as "rat" instead of the ASCII graphics of the other enemies, as a nod to the prequel.
Damage-Sponge Boss: The giant tea kettle in the desert fortress. It doesn't attack, it simply tests your patience with its ludicrous amount of HP.
Dangerous Forbidden Technique: The Black Demons spell summons a wave of invisible demons that do massive damage to everything on the screen, including you and your summoned allies. With good armor, though, the damage to you is manageable, and it becomes something of a Disc One Nuke.
Dangerously Genre Savvy: Try to escape the wolves in the forest by jumping over them? Those forest spirits will fire painful green shots that hit you at jumping level.
Try using any of the more advanced spells against the Developer? He summons a black hole that instakills you. Of course, there's a way to use this to kill himself.
Difficulty Spike: Try to go into the desert immediately after you face down the rats, without buying an Iron Axe. You'll get destroyed by the camels.
The forest, after beating the troll. The club you obtain hurts a lot, but it's not enough to face down the huge pack of wolves coming towards you.
Early Bird Boss: Both the monkey magician and the octopus king. You face them in the second dungeon of the game, and if you fight them at your level, you'll get wasted. Thankfully, both of them are optional and are meant to be fought later on.
Endless Game: The sea. After the initial waves of fish/jellyfish and seahorses, you'll encounter sharks and sea serpents that will come at you in increasing frequency until you either die or escape.
The "Super RPG" and "Galactic Wars" games in the arcade. You keep going until you run out of health.
Exact Words: The squirrel says you have to get three-in-a-row to beat him at Tic Tac Toe. He doesn't say you have to put your X-es inside the grid...
Forbidden Fruit: The instructions warn you to never put any candies in the cauldron while brewing berserk potions. This is absolutely not the means of producing cloning potions.
Game Within a Game: The house to the right of the shop has a game console, with a dungeoning game (full of references to the original Candy Box), and some obnoxiously difficult "Copter" type of thing.
Hoist by His Own Petard: The easiest way to kill the Developer is to cast one of the spells that makes him drop a black hole on you while you're standing next to him. If you're in turtle mode and have over 1500 health, you'll survive and his black hole will kill him.
Hopeless Boss Fight: Subverted with the dragon. His impenetrably high HP is displayed as "so much hp / so much hp." But after a bit of futile attacking, he turns out to be friendly, and becomes a Quest Giver.
Interface Spoiler: You know that something's up when you don't see any spell, potion or action buttons when you fight it.
Infinity–1 Sword: The scythe, which the blacksmith sells when you reach a certain point in the game. It swings crazily fast and makes a decent amount of damage per swing. It is usually preferred by players over the Giant Spoon of Doom.
Infinity+1 Sword: The Giant Spoon of Doom. It's attack speed is slower than a snail with rheumatism, but it does enough damage to kill almost any mook in a single swing.
Not Completely Useless: The un-upgraded octopus king crown, though generally pointless, is actually useful for one thing. Wearing it allows you to defeat Yourself. Because... it makes you confident, apparently.
Pixel Hunt: The pogo stick, one of the most useful items, is acquired by clicking an asterisk hidden in the mountains on the world map.
Rare Candy: The Chocolate Bars. Unlike the first game, there are more than one of these.
Rat Stomp: The first quest has you clear rats from a villager's cellar.
Savage Wolves: The forest is filled with them, and they keep coming at you in a near-endless stream.
Secret Level: The "fight yourself" level, reached by drinking an X potion.
Sheathe Your Sword: You can now switch back to old equipment between quests, even back to fighting barehanded, which minimizes the effect of Attack! Attack! Attack! and allows you to pass the unkillable ceiling monster that crushes you in retaliation for breaking any of its eggs.
The fan-submitted stage "The Hardcore Platformer" is filled with these on the floor and the ceiling (so you can't use Rocket Boots). And you can't cheat via anti-gravity potions- they don't work. The last stretch is a fake except for the final spike.
Stone Wall: The enchanted knight armor reduces all damage you take by 80% (!!), but it halves your damage output. Pretty much essential when facing the Devil or fighting the sharks in Hard mode.
Threatening Shark: Get far enough in the sea and you'll start fighting them. Some of them have different-coloured fins which grant special abilities if you kill them and collect their fins.
Title Drop: This version has an actual candy box, but you can't open it until the end.
Under the Sea: "Jump into the sea." No scuba gear required! Becomes an endless Marathon Level, with an ever-increasing onslaught of giant sharks and invincible missile-spewing snakes. If you survive long enough, some of the sharks drop magic fins. The last fin, which appears when the sharks are spawning so quickly there's barely enough room for them all, gives you a deadly black hole spell.
Video Game Remake: Most of the same basic elements and levels are there, but in a larger format with better graphics. There are also several new levels, puzzles, and items.
Wake-Up Call Boss: The troll. If you don't have a silver sword or enchanted glove, it's going to be quite hard to take down.