Irem themselves developed and published this 1990 handheld, monochrome remake of the classic Kung-Fu Master, and it is not too bad, all things considered.
Cinemaware‘s classic Defender of the Crown was ported to the Game Boy Advance by Crawfish Interactive and published by Metro3D in 2002 and it is an excellent conversion.
It was first released in 2004 and features modernised graphics and gameplay, but the same core gameplay as the 1986 original.
Castlevania: The Dracula X Chronicles is a 2007 remake of the 1993 PC Engine CD game, Castlevania: Rondo of Blood, with 3D graphics, but used in a 2D, side-scrolling manner.
Gameplay is identical to most other Castlevania games – even though it uses 3D graphics – and Konami must be given credit for not mucking it up, even though they could easily have done that.
Mega Man Powered Up is a 2006 remake of the original NES Mega Man game, only this time with ‘chibi’ style graphics and a host of new gameplay options.
Not least of which is the ability to play the game as any one of Mega Man‘s arch enemies – once you’ve beaten them in a boss fight.
Developed by TOSE and published by Capcom for the PlayStation Portable in 2006, Ultimate Ghosts ‘N Goblins is a remake of the classic arcade game Ghosts ‘N Goblins (and its even better sequel, Ghouls ‘N Ghosts), combining them together with new levels, new enemies, new weapons, new armour, new bosses, and new 3D graphics.
A conversion of an MSX2 remake of the classic arcade game, Xevious, published on the PC Engine by Namcot in 1990. And – like a lot of PC Engine shooters – it is a good experience.