Here's why:
* "Game of Death" was a project Bruce Lee started filming in 1972, but he never finished it due to his untimely death in 1973.
* "Enter the Dragon" was filmed in 1973, and it became a huge success, establishing Bruce Lee as a global icon.
* The success of "Enter the Dragon" overshadowed "Game of Death," and production on "Game of Death" was effectively halted.
After Bruce Lee's death, the film was completed using footage shot for "Game of Death" and some scenes featuring stand-ins and stuntmen. It was released in 1978 and was a box office success despite being incomplete.