Game (plugin)

Where can I get the latest working version of the game module to work on Moodle 1.8.7?

The version in CVS and the version on the Moodle module download page [game(2).zip] make reference to /moodle/lib/gradelib.php. I belive this is a Moodle 1.9 file. The file does not exist in Moodle 1.8. I get the following errors:
Warning: require_once(/var/www/eclassroom/moodle/lib/gradelib.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/eclassroom/moodle/mod/game/lib.php on line 398

Fatal error: require_once() [function.require]: Failed opening required '/var/www/eclassroom/moodle/lib/gradelib.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/eclassroom/moodle/mod/game/lib.php on line 398


I have tried versions 1.6.8 and version 2 [game-080724.zip] and both have problems with the grades/score reported.