Instructions
Ps3Title
Open your browser, and visit PS3hax.net.
Click on "Downloads" in the navigation bar at the top of the page.
Click the "Search" link in the "Navigation" bar, and type in "ps3title." Click "Search." Click on the "ps3title" search result, and click "Download" in the upper-right corner to download the ps3title software. Save the file to your desktop.
Open the downloaded folder, and double-click the "ps3title.exe" file within it to launch the program.
Type in all or part the title of the game you wish to know the PS3 Game ID for into the "Search" field, and press "Enter." The program will return the Game ID in the Search bar.
PS3 Index
Open your browser, and visit Damox.net.
Hover your mouse over "PS3 Games" at the top of the page; then scroll down and click on "All." A complete list of all games will appear.
Type in all or part of the title of the game you wish to know the PS3 Game ID for into the "Search" field in the top-right corner of the page. The website will automatically return games relevant to your search.
Locate the Game ID beneath the "Title_ID" section on the page.
Sony Index
Open your browser, and visit Sonyindex.com.
Click the "Name" link next to the "PS3" section, beneath "US" column.
Scroll through the list, and locate the game you wish to know the Game ID for from the list. Games appear in alphabetical order. The Game ID is located to the left of the game.