Kien, a fantasy hack-and-slash game for the Game Boy Advance, was originally announced in 2002.
Kien's development took two years, starting in 2002. However, due to multiple cancellations and delays, it was not officially released until 2024, making it the most-delayed video game in history.
Kien's release was initially canceled by its publisher due to concerns that the game was too much of a financial risk to release. This decision was made after the game was completed, and the publisher conducted market analysis that determined the game's potential success was uncertain3.