Hints for The Invisiclues by Undo Restart Restore

Download this page by right-clicking on the page and choosing Save page as... or from the File menu of your browser. You can also download a minimal page by clicking the link and doing Save page as.
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Edit the page with a plain-text editor (not Word or OpenOffice.)
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Edit the document's text and copy-paste as many hints as you need. You see tags like this:

<a href="#" onclick="document.getElementById('downloadPage') ...
<div id="downloadPage" style="display:none;">

These will show the next hint when the link is clicked. When adding new hints, you have to remember to change the ids (downloadPage in the example above), but use the same tag for only one hint. If you use same ids for multiple hints (an easy mistake to do when copy-pasting) the hints probably won't work.
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Save the page and open it in a web browser to test how it works.

Internet Explorer usually disallows JavaScript on local files because of security reasons.
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This affects local files only. If you upload the file to a web server, this shouldn't be a problem.
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If you distribute the hint page with the game, you might want to add a notice between the <noscript> </noscript> tags near the beginning of the file that Internet Explorer users should allow the file to use scripts or blocked content.

You can use HTML tags and CSS to format the page as you wish. Google for "html tutorial" to get started.