BUBBLE BOBBLE Neo

Contrary to the description, there are only 6 rooms for this achievement.

For this achievement you need to get to levels 17, 23, 28, 36, 46 and 52 in Arrange mode without using a continue. On each of those levels a door will appear that will take you to the secret room, so you need to hang around on each of those levels until the door appears. Otherwise you may miss it if you skip the level with an umbrella or finish the level before the door has a chance to appear.

The best method for this is if you die to exit before you respawn, save and reload, preserving your lives.

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 can 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.