Here a beginner walk-through for levels 1-50 for Flash Circle TD, note that the game goes on for a lot longer than 50 levels.

This Video walk-though is for Bloons Tower Defense

This is the walkthrough for 10 gnomes 5: the Shipyard

Walkthrough for Bloons Tower Defense 2:

Medium:

Hard:

There is not a walkthrough for easy because if you can beat medium and hard, you can obviously beat easy.

Video Walkthrough for Bloons:

Here is a walkthrough for Canyon Defense:

Here’s a walk-through of 10 gnomes 6: The Hall

Here is a video walkthrough for 10 gnomes 6: Foggy Flat: