In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Tracy Allen wrote:

CR2032 lithium coin cells are dirt cheap, and they can last a long time in a project like this with no regulator and careful use of SLEEP.    At 10 microamps, say, with the game asleep (waiting for someone to pick it up and press a key to play), the CR2032 at 220 milliamp hour capacity could sit around for 22000 hours, over 900 days.   (0.220 / 10E-6).   Keep the flashes short and use a large capacitor across the battery to supply the surge current.

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