Scratch

I don't think this is possible yet, but it should be with Scratch 2.0

Sorry here's scratch blocks
(scratchblocks)
when gf clicked
set (score) to 0
forever
if <touching (Sprite2 v)>
change (score) by (1)
add (score) to (previous scores) //edit this for the kind of leaderboard you want
wait (1) secs
end
end
(/scratchblocks)

Got confused so here's scratchblocks (i tested them this time)

when gf clicked
set [score] to 0
forever
if <touching [Sprite2 v]>
change [score) by [1]
add [score] to [previous scores] //edit this for the kind of 
wait [1] secs //leaderboard you want
end
end

tree-hugger wrote:

I don't know a way to save previous scores... but I have other ways to make leader boards.

Way #1: The player goes against themselves and shows all their scores from their playing session.

when gf clicked
delete [all v] of [leader board v]

when I receive [game over v]
set [score to check v] to [1]
set [last place? v] to [1] 
repeat (length of [score board v])
if <<(score) > (item (score to check) of [score board v])> and <(last place?) = [1]>>
insert (score) at (score to check) of [score board v]
set [last place? v] to [0]
end
change [score to check v] by (1)
end
if <(last place?) = [1]> //The way you had it, the score would always be added to last place, whether it's supposed to or not
add (score) to [leader board v] 
end

Way #2: Put player up against fake people.

when gf clicked
delete [all v] of [leader board v]
add [Jimmy's score: 125] to [score board v]
add [Bob's score: 372] to [score board v]
add [Junior's score: 433] to [score board v]

when I receive [game over v]
if <(score) > (Jimmy's score)>
  say [you beat Jimmy!] for (2) secs
end
if <(score) > (Bob's score)>
  say [you beat Bob!] for (2) secs
end
if <(score) > (Junior's score)>
  say [you beat Junior!] for (2) secs
end

Hope those are useful 

Fixed #1, part 2,