This is a much better way than "help pages" because the item, which is important to explain/point out, is directly highlighted with the text. Simple to set-up, data is added from a script table.

There is a free and a commercial version available. The commercial version has additional features:

• change sheets during tour
• call bookmarks with selections while showing a tooltip
• auto-launch a tour first time (good to show "Whats new in this release") and remember if a user already visited this tour
• no commercial at the end of the tour