Solitaire Carcassonne Variant - "Carc Island"

I just stumbled on these old solo rules of mine that I had posted elsewhere about two years ago. Figured I'd post them here for posterity:

This solitaire variant of Carcassonne uses the standard rules modified by a bounded formation called "Carc Island."

SET UP: Place the starting tile on the playing surface. The starting tile will become the center tile of a 7-tile x 7-tile square layout. Play is bounded by this layout for the entirety of the game.

PLAY: Draw and place new tiles and score followers as usual. When a tile cannot be played or the solo player chooses not to play one, the tile may be discarded. No more than three tiles may be discarded in this manner.

THE END: The game is over when the 7x7 layout is complete, OR when a tile is drawn that cannot be legally played or discarded.

SCORING: Score the game as usual. When including tiles from the Inns & Cathedrals expansion, success may be gauged in the following manner:

• Complete Success - Carc Island is complete and you've scored 150+.
• Partial Success - Carc Island is incomplete and you've scored 100+.
• Failure - Carc Island is incomplete and you've scored less than 100.