Yes
I presume you are using the action Next Room. Instead of that, use the action Different Room. This takes you to the room you select. So, lets say when you collide with the secret door, you just write that action. Or lets say that if the score is higher than 100, you go to the secret room...
Simples!
Mario level designer
for make a game in game maker. go to. www.youtube.com/watch?v=6pGOgjZCOBo
How DON'T you make a health bar in Game Maker.
It depends what sort of game you want to make. RPGMaker can make only RPGs but it's much easier than Game Maker.
Any game maker can create a ninja game. Most choose not to.
No, there is no programs that automate the prosess for you. You may search for some tutorials on youtube on how to make your own game
You could use game maker. Download it by typing download game maker. This will be a freeware
download game maker 8.1
You kill people
It depends on what you want to make.
Make a game... and it depends on what type of game that requires the certain expertise.
Game Maker contains a fully functional programming language (GML, or Game Maker Language) which allows you to create game engines, games, applications, utilities, etc...