Text-only adventure. Infocom fanatics and CAMRA types only need apply. Just kidding. The name Unnkulian Underworld might sound like one of those adventure games - lots of quasi-mystical old hermits, an aversion to vowels, a bizarre quest - and it is. But, brace yourself, it's got a sense of humour as well. The usual screenful of text is still an intimidating prospect, though the whole thing is done with an articulate and tongue-in-cheek readability usually so sadly lacking in other games of this type.
The parser is reasonably powerful, enabling you to have limited conversations with characters. The separation of commands with commas gives you an increased speed of progress through the more functional and boring bits.
It's essentially the story of an ex-slave - who just happens to be you - who toddles off to seek his fortune after his master sods off to the big spell-laboratory in the sky. As the screenshot shows, it contains some highly weird problems and solutions. However, it also has plenty of the more conventional adventure-game problems, enabling the beginner to get stuck in without being laughed at too often.
The game was developed on the TADS text-adventure creator - which offers quite a decent vocabulary and word-crunching system - with only the old familiar "Thye look like ordinary stalactites to me" hassle. Sacks of humour and immensely playable. Looks terrible, feels terrific.