Move the rings to their post
Transfer the whole stack from the first post to the marked destination. Select a post, then another to move its exposed top ring. Three posts give you one spare place to rearrange the stack. Choose between three and six rings.
Keep the sizes in order
Move only one ring at a time. A larger ring cannot rest on a smaller one, and a buried ring cannot move until the rings above it have left. Colours help you follow the pieces, but their diameters determine which placements are legal.
Try the same stack again
Your move count records completed transfers. Undo restores the previous placement; Restart puts the selected number of rings back on the first post. Finish with the entire ordered stack on the destination. There is no timer, so plan the next few transfers at your own pace.