Here's some more info on the Game Boy Color version of Denki Blocks!
Denki Blocks! on the Game Boy Color
The Game Boy Color version of Denki Blocks! has games for one or two players.

Games for one player

Tournament

Tour Puzzle Island, meeting Islanders and solving their Tournament Puzzles. Solving any 15 out of the 25 puzzles earns the player a ranking award and allows progress to the next ranking. There are seven rankings to progress through before the player gets the chance to become the new Puzzle Master by solving a further set of puzzles.

Players who solve all of the puzzles presented by an Islander will get the opportunity to solve that Islander's Personal Puzzles. Completing these puzzles will earn the player a Personal Item from the Islander.

Some puzzles in Tournament have Bonus shapes which can be made. Some puzzles have Three-Of-A-Kind solutions

Workout

Solve as many puzzles as possible in a set time.


Games for 2 players

Battle (Islanders do not play Battle)

Players take turns to move blocks until a join is made. The player who joins all their blocks wins the game.

There are 4 Battle boards to choose from.

Race

Players race to be the fastest to solve puzzles. There are two lengths of race to pick from.

Release and Languages

The European version was released on 19th October 2001 and has English, French, German, Spanish and Italian language options.