Stickle bricks - the poor persons lego
Tressie - yep, had one of them plus had a Lone Ranger doll instead of a Ken doll - kept making them get married and ride off into the sunset together.
Also had Pippa dolls - there were about 100 in the series, 97 women and 3 men dolls.
Stylophones - nearest I ever came to mastering a musical instrument
Mastermind - can still buy these
Rubics cube - used to cheat by peeling off the stickers - and did anyone ever try Rubics clocks or Rubics snake?