That's correct - the RAMBO - atari 2600 clones were the most "wide spread"
The Game & Watch clones produce in soviet were also on the market, especially in the eastern part of the country, folks from border were bringing those to sell in Romania for profit
But there were also Tetris 99-in-1 cloned.
And other type of electronic games, all kind of shapes and sizes coming from western countries (Germany, Austria .. etc)