High Flyer is a great six card from the 70s, and the first Bally six card with the red diagonal feature. This allows for scoring on the 'off numbers' on the card, meaning, the numbers which are not connected by the primary vertical, horizontal or diagonal.
It is also the first game that allows for toggling the super lines and corners scoring on all cards at once via rollover button, and includes the ascending scores per card, and double or nothing play when it detects a winner.
A very good game, and those that follow allow for really high scoring, but High Flyer has some great gameplay.
It has three search discs - one for each set of two cards - to accommodate the corners, red diagonals, and standard scoring on each card (each search disc is 50 positions).
This would be a great first game for someone - the mechanical components are not incredibly complex and the gameplay is fast and fun.