Pushover is a fun puzzle game originally published by Ocean in 1992.
In this game you control an ant that can walk along platforms that
are connected with ladders. On those platforms are dominos that need
to fall according to some rules.

* All dominos must fall and none must crash into another
* One special domino must fall as last domino and that domino
triggers the exit door to open when you enter the exit door
the level has been completed
* You may rearrange as many dominos as you want, except for
the trigger. You may not place dominos in front of the doors,
except for the vanishing domino.
* You may push push once to start a chain reaction with the
dominos leading to the fall of all of them
* All this has to be done within a time limit (which is normally
generous)
* There are 10 different dominos that behave differently when
pushed, some fall, some not, some wait a bit before they fall,
some raise, some toppler until they meet an obstacle
* There is a help in the game and introductory levels that show
how all the dominos work