An approximative map of the non-Varangian cultures in European Russia, in the 9th century. The Meshcherian area is shown in red
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The Meshchera language was a Finno-Ugric language  spoken by the Meshchera tribe, in what is today the Oka River basin in Russia. Very little is known about the language, but it was probably closely related to the Mordvinic languages Moksha and Erzya. Meshchera language probably became extinct by the 16th century.
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
English dictionary Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).