Challenger

The player controls the main character, Challenger, and must head towards the goal in each level. The player can attack by throwing knives, but some enemies are invulnerable to this attack, and require a power-up item or the assistance of a hidden character to defeat. In levels 1, 3, and 4, touching any of the enemies results in a loss. The player can jump in the side-scrolling scenes, and can also duck by pressing down in the first level. In most other games, the A button is used to jump, and the B button is used to attack, but in Challenger, the controls are reversed, where the A button causes the character to attack, and the B button causes them to jump. The player also falls off the train and loses if they throw a knife while they are on the connecting area between train cars.

A life gauge is used only during the second level. The player receives damage whenever they touch enemies, and loses only when their life gauge reaches zero. There is no jump button for the top-view level, but the player can venture across the island to search for items. A timer is displayed on the upper right corner of the screen during all of the levels, and the player also loses a life when this timer reaches zero. Falling off of very high places or getting caught in traps also results in a loss, and the player is taken to the game over screen when there are no lives remaining.

[Difficulty]
The player can also choose the game's difficulty from 16 different settings on the title screen. The number of enemies decreases for lower level settings. However, the player must defeat certain special enemies in order to gain items required to complete some levels, and the decreased number of enemies on the lower difficulty settings actually makes it more difficult to finish the game. Therefore, the lowest setting is not necessarily the easiest difficulty setting.

[Levels]

Screenshot of the "Stop the Express" level in Challenger.
The first level is titled "STOP THE EXPRESS!". The villain, Don Waldorado, has abducted Princess Maria, and is escaping on a special express train. Challenger heads for the front train car while avoiding Waldorado's cronies, but Waldorado cuts off the connection between the rear train cars and escapes after pushing Challenger off the train.

The second level is titled "SEARCH PRINCESS!". The challenger arrives at Waldorado island in search of the princess, and ventures through an extensive 4-directional scrolling game map. Entering certain caves or buildings allows the player to advance to the second and third levels, but others may be dangerous trap zones which can cause instant death.

The third level is titled "GET KEYWORD!". The princess is now being held captive in a pyramid, and Challenger must gather the three keyword items (a key, a ring, and a crown) that are spread throughout the third level in order to enter the pyramid. The level takes place in the inside of a cave, where Challenger must use the gushing fountains of water as steps to cross over to the other side. There are several entrances to level 3 located on Waldorado island, so the player can head for the pyramid by going back and forth between the second and third levels.

The fourth and final level is titled "RESCUE PRINCESS!". Challenger arrives at the pyramid after collecting the three key items, and must jump across several dinosaur-shaped rocks to reach the top floor, where he will face Don Waldorado in the final battle. The player returns to the first level after the conclusion of the fourth level, and the game's difficulty increases by 2 settings.