BUBBLE BOBBLE Neo

This one is a lot easier than it seems. You have to reach levels 20, 30 and 40 in Classic mode without being killed. You would think that´s insane, but actually it´s just a matter of time.

Just start playing at level 1, and if you die anytime, just press start and exit the game through the game menu (not the guide). This will save your game in that level, without losing your previous life. So start again and you will be on that level again. Everytime you die, just exit through the game´s menu and start again.

Try not to pick umbrellas, as they can make you skip some levels and you could end levels 20, 30 or 40 without actually playing them, and that would mean you would really have to start over again.

Once you reach each of those three levels, a door will spawn after some time. Pick it and you´ll enter a secret room. Once you enter the third one, you will earn the achievement.

A simpler way than above, you can play to the levels you need to, then save and quit, and it will reset your continues to zero.

You die and continue as many times as you want, as long as you quit when you get to the level that the door is on.

HOWEVER, you still need to get all of the doors in one game play or you will not get the achievement.

Just to add to the solutions, If you accidentally pick up an umbrella (parasol) like I did, just pause the game and save and quit.

When you restore your session you will go back to the level you accidentally picked up the umbrella on and still be able to get the achievement :)

Also, If you happen to not get to the door in time, do the same as above and the door will still appear and will not effect you getting the achievement.