Question for October 15

Hint: It is a computer game.

What am I talking about?

• I, J, L, O, S, T, and Z are the official names for the structures used in the product as mentioned in the official manual but other names do prevail among common users.

• It is one of the most popular products in it's category but the person in the image made almost no money out of it, despite being the inventor, due to the Soviet system of communism. However, in 1996 he created a company that now holds the sole rights to it across the world and has licensed it to numerous companies in order to derive revenue from it.