For other uses of Sonic the Hedgehog, see Sonic the Hedgehog (disambiguation).

Sonic the Hedgehog is an educational game for the Leapfrog Didj learning system released in 2008.


The gameplay is similar to the original Sonic the Hedgehog games on the Sega Genesis but features various minigames that focus on spelling.

The game features seven levels based on various Zones from earlier Sonic games. The levels in order are:

Zones marked with a * indicates that the level has a boss fight. Defeating the boss will earn the player a Chaos Emerald, with the color depending on the Zone the boss fight took place in. The player earns the green Emerald in Emerald Hill Zone, the purple Emerald in Hydrocity Zone and the yellow Emerald in Chemical Plant Zone.

Defeating the boss of Egg Base Zone awards the player with the Master Emerald before the credits. If the player earns 600 points, they will be able to "customize" the game online by changing Sonic's animations, the music playing in the background, and the animals that pop out of the Badniks when defeated.


The minigames are activated by running through Giant Rings. All of the minigames involve collecting letters in some way. The player must collect all the right letters to spell or complete a word. Pressing the left shoulder button will repeat the instructions while pressing the right shoulder button will repeat the question. Completing a minigame awards the player with a gadget. There are a different amount of gadgets within each level. The design of the area the minigame takes place in changes depending on the level.

Word wheel minigame

Word wheel minigame

This minigame starts with Sonic standing on the word wheel, which looks like a giant screwdriver with letters printed on the sides. The letter currently selected is highlighted in yellow. Moving left and right causes the word wheel to move, thus changing the letter selected. Pressing A causes Sonic to jump and pull the lever above. Pressing up on the D-pad activates capital letters.

If the letter the player selected is correct, it is placed inside a box which is located the bottom of the screen. Collecting all the right letters causes 10 Rings to appear on the ground and allows Sonic to hop off the word wheel to collect them.

Cannon minigame

Cannon minigame

Sonic will enter a cannon during the game's tutorial. Enemies will pass by a large cannon with Sonic inside. The enemies are carrying large monitors, each with a random amount of letters with them. On the top of the screen is a box with an incomplete word. The player needs to aim the cannon with the D-pad and press A to launch Sonic into the monitor. Sonic will run back inside the cannon afterwards.

Breaking the monitor with the right letters causes 10 Rings to appear on the ground, which Sonic will automatically collect while running back to the cannon.

Monitor minigame

Monitor minigame

The game starts in an area with two platforms, one from the left to use as stairs and a bigger one coming from the right. The right side also contains a spring for the player to reach the bigger platform. Unlike the other two minigames, which involve selecting the right letters to spell/complete a word, all the correct letters to spell the word are located inside monitors, but the player has to open each one in order.

Opening all the monitors in the correct order causes six Rings to appear on the ground and six more Rings on the bigger platform, which Sonic can collect before the next question.


  • Due to the game's similarities to the original Sonic the Hedgehog trilogy, it can be considered a loose port.
  • The game was developed by Realtime Associates, in which they previously made games for the Sega Genesis, the Sega Pico, and the Sega Saturn, with Sonic making a brief appearance in Realtime's Bug! for the Saturn.
  • The game's logo is derived from the logo for Sonic the Hedgehog (2006).
  • This marks the second Sonic game on a Leapfrog learning system, the first being Sonic X. Both games were made by the same developer, but Sonic X focused on mathematics while this game focused on spelling.
  • This game uses the sprites of Sonic from Sonic the Hedgehog 3 and Sonic & Knuckles, although the fur of Sonic's color is from Sonic the Hedgehog Spinball.
  • Despite the name, Green Hill Zone actually uses textures from Emerald Hill Zone.
  • All the music from this game are remixes of music from older games:
    • The title music is the same title music as Sonic & Knuckles.
    • The theme for the main menu and the credits is the same music used for the ending theme of Sonic 3D Blast on the Sega Genesis.
    • The theme for Green Hill Zone and Emerald Hill Zone is the theme for Mushroom Hill Zone, Act 1 from Sonic & Knuckles. A sped-up version is used when Sonic collects the Power Sneakers in any stage.
    • The theme for Sandopolis Zone and Hydrocity Zone is the theme for Sandopolis Zone, Act 1 from Sonic & Knuckles.
    • The theme for Scrap Brain Zone is the theme for Flying Battery Zone, Act 1 from Sonic & Knuckles. Different versions of the theme are used for Chemical Plant Zone and during the monitor minigame.
    • The invincibility theme is the same invincibility theme from Sonic & Knuckles.
    • The music for clearing a level is the same act clear music from Sonic the Hedgehog 3.
    • The Slot Machine music from Sonic & Knuckles can be heard during the word wheel minigame.
    • The Special Stage theme from Sonic the Hedgehog 3 can be heard during the cannon minigame.
    • The Act 1 mini-boss theme from Sonic & Knuckles can be heard in Egg Base Zone, as well as during a boss.
    • The Game Over theme from Sonic the Hedgehog 3 can be heard when the player loses all their lives.
  • The title screen itself uses Sonic's sprite from the title screen of the original Sonic the Hedgehog, but the title screen in the Didj's main menu uses Sonic's sprite from the ending of said game.



Sonic The Hedgehog Didj Commercial

Sonic The Hedgehog Didj Commercial

The game's trailer.

Sonic the Hedgehog spin-off video games
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