These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The "spot the difference" stages in Point Blank 2. Mainly because if you shoot an object in the lower picture that's the same in the upper picture, not only does the game count your shot wrong, but you lose a life.
Colored target coasters, because of how closely packed the moving targets can be. Remember that shooting the other player's targets costs you lives.