It is my personal advice that you finish the game at least ONCE before consulting this FAQ.

For those having issues finding the location of certain BONUS GAMES, here they are with screenshots to help out!

Shoot the wall and the way will open.

Shoot up and the game will fall down.

Just walk to the left of the screen.

Again, just walk to the left of the screen.
And forget the girl... It can't be saved.

You'll have to jump into the floating platform that's going left and right, and then from that platform, into the hole in the right of the wall. (And there's no way to get to that alien...)

Same process as previous, but more difficult. Jump into the floating platform that's going left and right, and then from that platform, into the hole in the right of the wall.

Coming Soon...

Coming soon, I hope...
Still haven't found this one out.
If anyone knows and wants to help, feel free to do so. =)

Wait in this room for 2 minutes. You can stay still, the character will just slide into the center and stay there, without touching any of the exit doors. Eventually, the game will fall from above. Keep in mind that if you fail the BONUS GAME, to repeat, you'll have to wait the 2 minutes again...

Make your way to the point of the screen shown in the image.

Again, make your way to the point of the screen shown in the image.
(Again... No way to get to the alien.)

This one in an extra for the FAQ.
Open the game, and head to the Password screen.
There, click the big Alien that appears flying on top of the screen.
You'll now be inside a Shmup mini-game.

When you start the mini-game, right at the beginning, get all the ships in the corner of the stage, and they will became 1 mega spaceship.

To get this achievement, all you have to do is clear all 4 stages of this game as this mega spaceship!

Be aware that Stage 2 and 4 are bugged out, and will keep showing the "MEGA" flash effect until the boss fight. It will be annoying, but after you play both stages a couple of times, you'll figure out the enemies patterns and even with the flash effect, it will be easy to pass them up.

I think that is all! Hope this little FAQ helps someone out!