Hard Mode is a mode featured in the Mario franchise that increases the difficulty level of the game. When playing in this mode, certain elements of the game are changed to reflect the difficulty, such as the enemy's strength.
Super Mario Bros.
After completing the main game in Super Mario Bros., the player is given the option to pick a world to play in "a new quest." At the title screen, the player can choose which world to start at by pressing before beginning Hard Mode. In this mode:
The player still has the same amount of time to complete each level. Mario and Luigi gain no special powers in Hard Mode, and they receive no extra points when they defeat an enemy. There is no reward for finishing the game in Hard Mode, and any subsequent playthroughs of the game will start over in this mode.
In Super Mario All-Stars and Super Mario Bros. Deluxe, Hard Mode becomes an actual second quest that the player must go through in order to fully complete the game. The text about pushing B to select a world is removed as the level select feature was redone for these games. These games use a star to indicate the mode, with All-Stars placing it before the level number (e.g. "World *1-1") and Deluxe placing it where the hyphen would normally go ("World 1*1"). Beating Hard Mode in Deluxe rewards the player with the text "Wow! You are a super player! Congratulations!" from Princess Toadstool as well as the Bowser Award in their photo album.
Super Mario Land
Hard Mode in Super Mario Land is unlocked after completing the main game, indicated by Mario's head replacing the Mushroom on the title screen. In this mode, more enemies appear in every level, and completing it unlocks a level select option.
Hard Mode in Yoshi's Safari can be played by holding , , , and pressing at the title screen. In this mode, there are several changes:
After completing the main game for the first time in Luigi's Mansion, the quest can be restarted in the normal mansion or the "Hidden Mansion". In this mode, the Poltergust 3000 has 1.5x more power, making it easier for the player to capture regular ghosts and Portrait Ghosts; Luigi takes twice as much damage, his Flashlight freezes ghosts in half the time in the regular mansion, and Hearts are more difficult to find and are smaller than usual. A gold star appears on the bottom right-corner of the screen when playing in the Hidden Mansion. The player can switch between the regular mansion and the Hidden Mansion anytime they speak to Professor E. Gadd. There is no reward for completing the Hidden Mansion.
In the PAL version, the mansion is flipped left-to-right, and the ghost placement is vastly different. The Boolossus fight is also completely different, with Luigi riding the Poltergust as though it was a car. Also solely in this version, the A-rank mansion can only be obtained on this mode, as the normal mode lacks enough treasure.
The 3DS remake of the Hidden Mansion is changed in all versions. All of the ghosts, portrait ghosts, and Boos have 1.5x their original HP amount; the Speedy Spirits' and Mario's items' locations (except for Mario's Star) have been changed; hearts are replaced by Poison Mushrooms (however, the player can still get hearts by defeating two or more ghosts at once); and more ghost mice and ghost fish appear in certain dark rooms. Bogmire and Bowser are also more difficult: Bogmire can disappear and reappear at another spot every few seconds, and Bowser's spike bombs explode upon his first throw (though they may not in his second and third throws). Chauncey retains the same battle effects from the original PAL version, while Boolossus's battle is the same as in the original mansion.
Mario & Luigi series
Mario & Luigi: Dream Team
In Mario & Luigi: Dream Team, Hard Mode is unlocked when the player completes the game on a file at least once.
When unlocked, an orange button with "START OVER IN HARD MODE" is shown on the file select screen at the bottom of the touch screen, which allows the player to start a new game file on Hard Mode. When selected, the player is given an option to choose which file will be chosen for Hard Mode; once the player creates a file on Hard Mode, it cannot be changed back to a normal file unless the player erases the file. A Hard Mode file has an orange label with "HARD" displayed on it.
In Hard Mode, enemies inflict much more damage and receive less, the timing on basic Jump and Hammer attacks is stricter, and the maximum amount of items the Bros. can carry is ten (wearing the Bottomless Gloves lifts this restriction in battles). Like the previous Mario & Luigi games, should the player lose in a battle in Hard Mode, rather than having the option to restart it, they will automatically be taken back to the title screen. Giant Bosses have different attack patterns than on a normal file, and the recommended levels for facing bosses in the Battle Ring have increased by five. Upon beating the final boss in Hard Mode, before the credits start, a two-screened image of Bowser, Kamek and the Elite Trio on the Koopa Clown Car along with Mario and Luigi standing in the coin shower can be seen, and after the credits the player gets to view a two-screened image featuring all the main characters and main bosses in the game.
Mario & Luigi: Paper Jam
In Mario & Luigi: Paper Jam, Hard Mode is exclusive to quests. When a quest is cleared in Normal Mode, Hard Mode is unlocked. Hard Mode raises the difficulty of quests by decreasing the mistake limit or time limit, making Paper Toads harder to catch, or speeding up the Yoshis in Yoshi races. Clearing a quest in Hard Mode gives the player an extra Medal.
Donkey Kong Country: Tropical Freeze
Hard Mode is unlocked in Donkey Kong Country: Tropical Freeze replacing Mirror Mode from the previous game after the player completes every single level in the game. When playing on Hard Mode, the player can select any of the four (five if playing the Funky Mode in the Nintendo Switch version) Kongs, but will only have one health, and cannot use any items in their inventory. Checkpoints will also not appear in the stage. Upon completing a stage in Hard Mode, it will be marked green on the world map.