There are three kinds of upgrades:

- Health Upgrades
Increases the number of times you can take a hit before failing the level.

- Size of the Collection Circle
Increases the size of the blue circle in which you must click rapidly to remove a piece of clothing.
This circle appears three times in each level.

- Faster Clothing Removal
Reduces the number of clicks required within the blue circle to remove a layer of clothing.

Each of the girls offers a chance to achieve three upgrades:

- Completion of EASY mode
Complete this mode on each girl to achieve an upgrade.
When you complete either EASY or CHALLENGE mode, the GALLERY (a CAMERA) is unlocked.

- Completion of CHALLENGE mode
Complete this mode on each girl to achieve an upgrade.
When you complete either EASY or CHALLENGE mode, the GALLERY (a CAMERA) is unlocked.

- Screenshot in GALLERY mode
When you take a SCREENSHOT of the girl in gallery mode you will unlock an upgrade.
To take a SCREENSHOT, hit F!2
If your F12 key shares another name, hit FUNCTION (fn)+F12 to take a SCREENSHOT

To see which upgrades have been achieved:

- Click on the photo of each girl
If you have completed either of the two levels, you will see EASY, CHALLENGE and a CAMERA

- Hover your mouse over each and the UPGRADE name will appear to left or right
If this upgrade HAS been achieved, it will appear in a pale YELLOW.
If this upgrade has NOT been achieved, it will appear WHITE.

**NOTE: In my opinion, the pale YELLOW was a terrible choice. On my screen, there is a very subtle difference between the two and they should have used a more distinctive color to denote a completed upgrade.