Here's a test db I put together that may help.

There are four fields:
latest -- the latest score, an integer
total -- the cummulative score, an integer
count -- a count of the number of scores that have been added into total
scores -- a list of the scores as a comma separated string

When a score is entered into field "latest" and the the field is closed, the code attached to field "latest" does several things:
1. it accumulates itself into field "total"
2. it increments field "count"
3. it appends itself to the list field "scores", and
4. it clears itself so it will be ready for the next score

Here's the code with some comments:

/* first add the latest score into the total */
e.total := e.total+e.latest;
/* note that we've added another score */
e.count := e.count + 1;
/* Tack the score onto the string list of scores */
/* Allow for the fact that you only need a*/
/* separator when there's already something there */
if StrFilled(e.scores) then
    e.scores := e.scores & "," & e.latest
else
    e.scores := "" & e.latest;
/* clear the latest score to make ready for the next */
e.latest := 0

And here's the actual export text file.  I can email this or put it on our ftp site if you like.

== DBNAME == _fields
[ [ '|soupName|, '|string| ], [ '|fieldName|, '|string| ], [ '|fieldType|, '|string| ], [ '|indexed|, '|boolean| ], [ '|table|, '|string| ], [ '|linkSoup|, '|string| ], [ '|linkField|, '|string| ], [ '|linkCondition|, '|code| ], [ '|fieldWidth|, '|int| ], [ '|fieldFlags|, '|int| ], [ '|defaultValue|, '|string| ], [ '|code|, '|code| ], [ '|decimals|, '|int| ], [ '|pKey|, '|boolean| ], [ '|fieldPath|, '|string| ] ]
test	latest	int							0		e.total := e.total+e.latest;\ne.count := e.count + 1;\nif StrFilled(e.scores) then\n\te.scores := e.scores & "," & e.latest\nelse\n\te.scores := "" & e.latest;\ne.latest := 0			
test	total	int							2					
test	count	int							1					
test	scores	string							1					
== EOD ==
== DBNAME == test
[ [ '|latest|, '|int| ], [ '|total|, '|int| ], [ '|count|, '|int| ], [ '|scores|, '|string| ] ]
0	25	3	10,8,7
== EOD ==
== EOD ==