Wikipedia page for Merlin

These came out in 78 and were sold through the 80’s. For some reason, inflation calculators for pounds sterling differ a lot, but looks like £22 in 1980 might be in the £90-122 range today.

Wikipedia says they could play these games,

  • Tic tac toe
  • Music machine
  • Echo, a game similar to Simon
  • Blackjack 13
  • Magic square, a pattern game similar to Lights Out
  • Mindbender, a game similar to Mastermind

And about the music machine,

The music machine game functions as a musical instrument; in this mode, each key is assigned a musical note, and sequences of notes can be recorded and played back. This makes Merlin one of the earliest digital sequencers as well as an early consumer-level electronic synthesizer.