7
Editplus works great for find-replace across multiple files
http://www.editplus.com (you can use an evaluation version)
for cloning a module, i'm sure you can search and find topics that discuss how to do it, but quick overview:
create a folder named gamereview or whatever you want to call it. copy all files from the tutorial folder into the game folder. open xoops_version.php, change the module title, dirname, rename the sql tables, and rename any templates that are listed (whatever.html)
open the gamereview/sql/mysql.sql file, find/replace the table names with the names that you created in xoops_version
go through every .php file in the module, replacing all references to the table name with your table name
find anything that is 'hard-coded' to the tutorials folder name, and change it to the gamereview folder name.
that should get you started, but i suggest using the Search box in the upper right of your screen to find a more detailed walkthrough