The iPhone, iPod Touch and iPad versions of Speedball 2 are now free to download.
But they will only be so for a few days, developer Tower Studios said.
The game is normally priced $4.99.
"This Free App a Day promotion will bring the game to the masses," said Tower boss and game developer legend Jon Hare.
"We have an awesome free new update due out soon and the more players we have before we release it, the better."
Eurogamer chased down Hare for a Speedball 2: Evolution interview earlier this year.
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