Metal Slader Glory went through a four year development process, during which the development team realized, despite having the script about 80% complete, there was no way they could fit the entire planned game on a Famicom cartridge, and more than half of the planned content ended up being removed from the final game. Despite this massive reduction, it is still one of the biggest Famicom cartridges ever released with a total ROM size of eight megabits.
Because of the long development time, Metal Slader Glory was released shortly before the Super Famicom (the Super NES outside of Japan) went on sale. As a result, only about ten thousand copies of the game were produced. It is believed that this, along with the fact that the game was one of the costliest games to produce as well as serious overspending on advertising, was what would lead to HAL Laboratory, Inc. filing for bankruptcy and eventually being purchased by Nintendo.
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