I found him!
to make a portal game and make new things happen in the game is not hard...this only depends on the saved values that record your entry into the game each time. For example: you will add a rule to the game: "If the player's entry count is 1, then a purple man will appear, representing him entering through a gate." ،And then, depending on the game, if the value of the variable *number of player entries* is 2, then text will appear below the game... and so on.... sorry for talking very much...