Wouldn't it be cool to make a custom built in level editor inside your game? Other users can make their own levels and play it in the game, share it within a community, and do what nots. Plus, you can easily churn out many levels with a level editor =

I would suggest making a level editor for puzzle/arcade games, something that doesn't require scrolling.

Here is an example of my approach; it works flawlessly:

Objects used:
1. INI - to store the data
2. File Object - for saving/loading
4. Active Object: "Blob" - a dummy object to work with
5. Counter "Count" - detects number of objects

Recommendation:
*Make a grid, it will be easy to place your objects on the screen. Have it so that a Box will move relative to your Mouse cursor. The box will move every 25 (for example) pixels- just like a "Snap To" in the Frame Editor. Left clicking will create a Blob inside the Box.

*Building a Grid - you can find examples from Clickteam. For simplicity, you can also use the EasyGrid object from Tigerworks.

Level Editor:
You built a grid (or not) and placed 5 blobs on the screen.

Saving:

1. Condition: Start of Frame:
Action: set INI file to: CurrentDirectory + "file". Note: Current Directory is an action from the File Object. This will save a file for the level.

2. Condition: Blob>0, Pick a Blob at Random:
a) Set INI group to: str$(Count's Value) [note: this is a counter changed to a string, it starts off with 0, then 1,2,...]
b) Set Item PosX=Blob's Xposition
c) Set Item PosY=Blob's YPosition
d) Destroy Blob
e) Count + 1

3. Condition: Blob=0
a) Set INI Group: str$(Count's Value)
b) Set Item "End" = 1

These three events will save your Blobs on the level, it will store their positions.

Loading:

set Count=0

1) Condition: INI Group: str$(Count's Value) Item "End" is not 1
a) Create a Blob at (-100,-100) (hide it)
b) Set BlobXPosition= Item "XPos"
c) ..same for Y position
d) Count ++


This is a simplified version for a level editor, but there are a lot more that can be done with it.

I'm currently developing Ballmaster2, it has a level editor that keeps track of over 10 different objects, build objects in order (ie: background first), store special conditions, and can be chained together to fit into a World (20 consecutive levels)

Hope this helps!