Challenge Land

Challenge Land (チャレンジランド) is a special land in Rhythm Heaven Megamix, which opens after clearing The First Gate and can be accessed by pressing the Challenges (チャレンジ) button on the touch screen while on any land. Unlike other lands, Challenge Land isn't part of the game's story.

Description
At Challenge Land, the player can board the Challenge Train (チャレンジトレイン) either solo (where they must pay the Challenge Charge (チャレンジ料金) of 5 coins) or with up to three friends (for free), where they ride through courses on the way to the goal, playing Rhythm Games with altered rules. The player is unable to play solo until after clearing Lush Tower. The player can play with friends via Download Play as well, but they can only receive rewards by playing the full version.

When the player successfully completes a course for the first time, they receive Flow Balls as a reward, which can be used to purchase Rhythm Games at the Shop.

Additionally, Challenge Land also contains the Perfect Campaign Headquarters (パーフェクトキャンペーンコーナー), where the player can attempt any ongoing Perfect Campaigns, as opposed to navigating to the location where the game normally is like previous games.

Rules
Additionally, games may have their, sometimes the player has a choice between two games, and "Game Gamble" Courses choose randomly from a pool of Rhythm Games. Courses require the course before it to be cleared to unlock.

Demo
Challenge Land is also available with three exclusive courses in the Rhythm Heaven Megamix Demo, however it is only playable in Multiplayer.

Saffron World
This set of courses is unlocked by default. This is the easiest world the player can take part in. The challenges in this world only contain the Rhythm Games up to Lush Tower, and can be unlocked to play solo after completing said tower. Rewards are one Flow Ball for normal challenges, and two for challenges. Clearing it is commemorated with a Badge.

Game Gamble: Beginner Superhard_3DS.png
Pool of randomly chosen games:

Saltwater World
This set of courses is unlocked by completing all of the normal challenges in Saffron World. This is a medium-difficulty world the player can participate in. The challenges in this world contain all the Rhythm Games up to the Songbird Tower as well as those from the Shop. This world can be unlocked to play solo after completing all seven towers. Rewards are two Flow Balls for normal challenges, and three for challenges. Clearing it is commemorated with a Badge.

Game Gamble: Intermediate Superhard_3DS.png
Pool of randomly chosen games:

Paprika World
This set of courses is unlocked by completing all of the normal challenges in Saltwater World. This world is the hardest the player can ever participate in with nearly all the songs being sped up. The challenges in this world contain the all the Rhythm Games (excluding some outliers) and can only be unlocked to play solo by completing Tibby's Mom. Rewards are two Flow Balls for normal challenges, and three for challenges. Clearing it is commemorated with a Badge.

Game Gamble: Advanced Superhard_3DS.png
Pool of randomly chosen games:

Trivia

 * While Saltwater World and Paprika World contain optional games from the Shop, there are no restrictions to unlocking challenges. This means some challenges can still be chosen despite containing rhythm games the player has never unlocked.
 * "Lockstep Lockdown" is the only course where the same game is played multiple times in the same course.
 * "Getting Vocal 2" is the only course changed for different regions. This is due to Lush Remix and Machine Remix having lyrics in the Japanese version, which were replaced with instrumental tracks in other regions.
 * "Wario...Where?" requires the player to clear all normal courses in Paprika World to unlock, while "Wario...Where? 2: The Sequel" requires those as well as "Wario...Where?" itself. The courses themselves also change the appearence of the Rhythm Games, replacing the main characters with those of WarioWare.
 * Tempo_Up_3DS.png uses a hidden multiplier, which can go up to 255%. A "Tempo Down" is also possible, which can go down to 1%, but it's never featured in the game.
 * A number of Rhythm Games never appear in any Challenge Train courses, those being Left-Hand Remix, Right-Hand Remix, Final Remix, Night Walk, Quiz Show, Big Rock Finish, Catch of the Day, and Love Rap, as well as the four Endless Games: Coin Toss, Sick Beats, Charging Chicken, and Clap Trap.
 * The Perfect Campaign Headquarters has three notes below the game's icon while a campaign is active. These turn off with each failure, and as such represent the three attempts the player gets at a Perfect. While having three attempts has always been a constant in the Rhythm Heaven Series, this is the first time this rule has been visually shown to the player.