For those who are curious, the games included in these photos are (clockwise from the upper-left): Pokémon Red (GameBoy), Engacho! (WonderSwan), Ganbare Gorby! (Game Gear), Guru Logi Champ (GameBoy Advance), Balloon Kid (GameBoy), Tane wo Maku Tori (WonderSwan), Magical Puzzle Popils (Game Gear), Rhythm Tengoku (GameBoy Advance) and Flash Koibitokun (WonderSwan Color).
I decided to take these photos when I discovered that the boxes that house Game Gear games are nearly the same size as those that house WonderSwan games. Also, I thought some of you might like to see how those boxes compare in size to the boxes of other portable gaming systems, like the GameBoy and the GameBoy Advance.
I'm planning to take more photos like the ones above (and these) in the coming months as I continue to acquire additional 3DS, DS, GameBoy, Game Gear and WonderSwan titles, by the way, so be on the lookout for them if you're curious about that sort of thing.
See also: 'WonderSwan cartridges (and boxes) in context'