Would you like to find out how well you can guess any word in a language you have never learnt?
Try your luck with Icelandic, Frisian, Faroese, Luxembourgish just to name a few Germanic languages with few speakers.
Are you a native speaker of a Romance language? Try your luck with Corse, Galician, Provençal, Occitan, Sardinian, Sicilian, Romansh ... and I must have overlooked a few, sorry.
Opt for "Test Your Language Vocabulary". You get a 60 questions multiple choice test.