Ghostwords

A hybrid of Uno and the word game Ghost. Players start with a hand of 5 cards, mostly letters, and in a turn a player may do one of:

Add a letter to the row(s) of cards on the table. Each row of cards is supposed to be a portion of a valid word.
Challenge the previous player to name a valid word for each row.
Play a specialty card.
Draw a card.

The first player to empty their hand wins.

Specialty cards include:

Wild: may be played to a row and stand for any letter.
Back At You: reverses play order.
Invisible: pass for one turn, and a challenge to you from the next player goes to the previous player.
New Ghostword: allows a new row of cards to be played to.

—user summary