When you load the game up, you will be taken to the Main Menu. From here you will have a few icons on the screen.
In the bottom left corner, there are two options; Settings and Ad-hoc Mode. Select the icon with the two played to load up the mode.
The game will announce that the Internet connection will be terminated in order to play this mode. From here, select the 'Create New Room' option.
You will notice when you are playing the game that there is a small Pencil Icon In the top right corner. Pressing this will pause the game, bringing up all the functions you can use in the game.
On the top row, you will see a Crown icon. Simply open this and choose any of the available themes.
You will receive a prompt saying that you are playing alone. Select 'Yes' to continue.
Once the contest begins, you can draw anything until the timer runs out. On the Judging screen, select the picture you just drew to win the contest and unlock the trophy in the process.