Ducks: Quack Attack gives a clue for each secret level in the included Read-Me! file. Check below to discover which one reffers to which level.
A secret level level right at the start. The clue 'The chase is on!' reffered to this secret. Move the green duck right to the end of the platform while ignoring the orange duck. When the aliens come close below drop down and run left. Before you reach the wall the duck will enter the secret doorway.
This one is pretty easy. The quickest way to do the level is to keep your green duck still while placing bricks on top of him because he will jump up onto the bricks. This way you can create one brick wide towers extrememly quickly and take the duck with you. Note that the bottle of wine in the middle of the screen is actually 37 in one and will give you a cool 370 points. There is also a bottle hiding behind the rocket.
The clue for this secret is 'Is it a bird? Is it a plane? No, it's a falling secret'. The right hand side of the level is empty because there is a secret doorway that falls down from the top off the bottom of the screen. If you build a bridge over the gap where your ducks are you can catch the doorway and access it.
Ducks will fall from the sky at the top of the level, slide down the roof tops, and come near the floating rocket in three different places. The easiest way to earn the most points is to quickly check which row contains the most ducks in it and try to catch them. You have lots of time in this level so you should be able to earn lots of points.
'Plumbers fanclub' is the clue for this secret. The plumbers part of the clue is obvious because of the pipes tileset. The fanclub part is reffering to the fan. At the start of the level head right into the teleporter. When you appear at the bottom head left into the teleporter directly next to you. Your duck will appear next to the fan. Just walk towards the fan and you will access the secret.
Another 'shoot the aliens' secret level. It is a lot easier to try to save the ducks on the right hand side of the screen than the ones on the left. Remember that all the aliens on the left will get caught and some need to be destroyed before more will fall. Don't destroy too many at once or else a large wave of them will suddenly appear.
The clue reffering to this secret is 'Harry Houdini???'. This is because you have to escape the box to enter the secret. The easiest way to do this is to keep moving the duck right. You will end up outside of the box and keep going until you nearly fall off of it. Two orange ducks will get zapped in the process but this doesn't matter.
There is only one way to do this level so that the duck will have enough time to collect all of the bottles at the bottom right hand corner while still collecting most of the other bottles. Start the level by instantly bridging over the edge of the platform that the duck starts on. He will turn around and head back. Buid onto the raised part of the platform on the right hand side of the level. This is all you need to do. The duck and saucer will do the rest.
The final secret is being reffered to by the remaining clue, 'Don't let your eyes decieve you'. In the bottom right hand corner of the level it looks as if there is two rockets. The one furthest to the right is fake. Teleport to the right of it and you should enter the secret level.
An original secret level here. You have to bouce the duck into the landscape for points while taking care not to kill him. Mainly try not to let the duck touch the fire at the bottom of the level but also take care of the fire on the tables. Most of the time when you destroy the ground under these fires the duck will bounce into it and die. Try to avoid knocking your duck over there.
A Flying Doctor's SonProduction