Push-Over

Push-Over is an obscure, practically forgotten Puzzle Game originally for the Amiga, also ported to MSDOS and the SNES. The game is based on the beloved pastime of setting up dominoes in a row and knocking them over, except now, half the dominoes have magical effects added to them: dominoes may do strange things like vanishing, exploding, or falling upward when struck. The aim of the game is to set up the dominoes in the proper order so that they all fall over.

The plot of the game features an old mascot of the British potato-chip snack "Quavers", named Colin Curly. One day, he's dancing around and he trips in mid-air, dropping ten packets of quavers from his pocket and down an anthole. A friendly ant decides to help him, but quickly finds that not only is the anthole a portal through space and time, one hundred doors stand in his way which can only be opened by completing domino puzzles. (Yeah...)

Due to clever puzzles and surprisingly memorable music, it's a recommended playthrough for any puzzle enthusiasts. The DOS version works fine on DosBox if you happen to find it anywhere, but the game has also seen several fan-remakes, a good one of which can be found here.

Tropes used in Push-Over include:

Incredibly Lame Pun: The player's character is named "G. I. Ant"
No Fair Cheating: If you use just one of the tokens you earn by beating levels, you will not get to see all of the levels, and will not get the best ending.
Only Smart People May Pass: The whole game. You have to solve domino puzzles to open doors.
Product Placement: The player's job is to return a bunch of potato chips back to their commercial mascot.