Sega has started to release free mobile versions of classic games from its back catalogue.
The first five, including Sonic the Hedgehog, are available now via the Apple and Android application stores.
The gamemaker said it planned to release additional titles every fourteen days for the Sega Forever service.
Some fans have complained about the first releases, saying Sega has done a poor job of converting the classic titles to mobile devices.
“Above all else Sega Forever is a celebration of nostalgia,” said Mike Evans, head of Sega’s mobile division in San Francisco, California in a statement. “It’s about allowing fans to reconnect with past experiences.
“It’s a very easy conversion to take those games to free,” Mr Evans told games web site GamesIndustry.biz.
As with numerous other applications, Sega said it’d run advertisements after and before the games were played. Nevertheless, it said it’d make it possible for players to avoid them.
“We’re just bolting in the advertising support model and a single in-application purchase that may disable those advertisements,” Mr Evans added.
Sega said it’d cost $1.99 in the United States and £1.99 in the United Kingdom to turn off the advertisements.
The on-line games catalogue will ultimately feature titles from all the Sega console eras. Initially Sega said it was concentrating on games for the Master System, Mega Drive and Game Gear consoles but those made for the Dreamcast and Saturn would follow.
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The first five games on Sega Forever are:
Sonic the Hedgehog
Phantasy Star II
Games can be played through a portable device’s touchscreen or by a controller. Sega said they’d also be playable off-line but people can save their progress on-line if they wish. The games firm said it’d eventually add a multi-player option to a lot of the games.
But not all fans of older games were satisfied with the arrival of Sega Forever. Retro games enthusiast John Linneman criticised the way they’d been transferred or ported to mobile devices.
He said the “lousy emulation” led to glitches during gameplay.
“There are loads of dropped frames, hitches and skips,” Mr Linneman told games web site Nintendo Life. “And once a notification occurs, it gets much worse. So it never plays smoothly.”