One of those games, as I'm sure you surmised after reading the headline above, is the WonderSwan version of NAC Geographic Products' amusingly gross puzzler, Engacho!
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I've owned the PlayStation version of this title, which tasks players with leading a frightened boy through tile-based stages while avoiding the putrid characters that can be seen on the box above, for some time now (read a brief review of it here) and I've enjoyed what I've played of it, so when I saw this portable port pop up on eBay I couldn't help but pick it up.
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In the meantime, I'll just stare at the game's packaging, which is pretty swell, don't you think?
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I also quite like the little cartridges (above) on which WonderSwan games appear, and the plastic sleeves that protect them. The cartridges are about the size of GameBoy Advance cartridges, by the way--in case any of you were wondering.
To see a few more snapshots of this particular pick-up, check out my Flickr photostream.
See also: previous 'Acquisition #123' posts