In the solo game it is about collecting as many points as possible. The game rules remain largely unchanged. However, the player can only play with 2 color and 2 number dice.
You only get 30 turns in solo play. To count your rolls, put half of slash in a column letter box after each roll. On every other turn, complete the "X" to cross off that column. Therefore, after the first two turns, the "A" in the "A" column will be crossed off.
Note this is done solely to mark the passage of turns, to count to 30. Crossing off a column title has no impact on the availability of that column. Crossing off all letters lets you know the solo game is over.
After 11 turns.