[HJG] This variation of [Lotto] by [RS] writes a log of each drawing to the console,
compares the drawing to the tip, and counts the matching numbers.

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 ##-#####################################################################
 # Lotto2.tcl - 2005-06-05
 #
 # Todo: 
 # * clicking on the numbers should set/reset the numbers in the tip
 # * use a text-widget or listview for the log
 # * Statistics (frequency of drawn numbers, winnings...)

  proc main {} {
     set dx 15
     set dy 15
   # pack [canvas .c -width [expr {$dx*8}] -height [expr {$dy*9}]]
     pack [canvas .c -width [expr {$dx*8}] -height [expr {$dy*8}] -bg gray77]
     set x $dx; set y $dy
     foreach i [iota1 49] {
       # .c create text $x $y -text $i
         if [lsearch $::MyTip $i]>=0 {
         .c create text $x $y -text $i -fill white
         } else { 
         .c create text $x $y -text $i -fill black
         } 
       # puts "$i : $x $y" ;# debug
         if {$i%7} {
             incr x $dx
         } else {set x $dx; incr y $dy}
     }
   # bind .c <1> {draw .c}
     button .b -text "Draw" -command {draw .c}
     pack   .b
     bind .c <1> {click .c}
  }
  proc click w {
    set i [$w itemcget current -text]
   #if $i<1 return   ;# ?? check if $i exists
    puts "Click: [winfo pointerx $w] [winfo pointery $w] : $i"
    $w itemconfigure current -fill red
   #...
  }
  proc draw w {
     global DrawNr MyTip
     incr   DrawNr
     $w delete marked
     set numbers [iota1 49]
     foreach i [iota1 6] {
         set n [ldraw numbers]
         lappend lucky $n
        #circle $w [$w bbox [ldraw numbers]] red
         circle $w [$w bbox $n] red
         update idletasks
        #after 500
         after  50
     }
     set lucky [lsort -integer $lucky]
 
     set n [ldraw numbers]
     lappend lucky $n
     circle $w [$w bbox $n] yellow
    #puts "$n: [$w bbox $n]" ;#debug
     $w lower marked
     puts -nonewline "[ format "%5d: " $DrawNr ]"
     for {set i 0} {$i<=6} {incr i} {
       puts -nonewline "[format [expr {$i==6 ? "- %2d" : "%2d "}] [lindex $lucky $i] ]"
     }
    #puts -nonewline "  Matches: "
      set win 0
      for {set i 0} {$i<=6} {incr i} {
        set z [lindex $lucky $i]
        if [lsearch $::MyTip $z]>=0 {
       # puts -nonewline "[format "%2d " $z]"
         incr win
        }
      }
    #puts "  Win: $win ."
     puts "  Win: [string repeat [string index "_...*!$$$" $win] $win]"
     if $win>3 { bell }
  }
  proc circle {w coords color} {
     $w create oval $coords -fill {} -outline $color -width 2 -tag marked
  }
 
 #------------------ Generally useful functions:
 
  proc iota1 n {
     set res {}
     for {set i 1} {$i<=$n} {incr i} {lappend res $i}
     set res
  }
  proc ldraw _list {
     upvar 1 $_list list
     set pos [expr {int(rand()*[llength $list])}]
     K [lindex $list $pos] [set list [lreplace $list $pos $pos]]
  }
  proc K {a b} {set a}
 
 #----------------------------------------------------
 
  lappend MyTip  1 8 11 15 47 49  16
  set     DrawNr 0
  catch {console show}
  puts "Lotto"
  puts "MyTip: $MyTip"
 
  main
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[RS]: For the question of how to identify the number under the cursor: [canvas] items receive unique integer identifiers, starting from 1. So if the 49 numbers are the first items created, their identifiers are the same as their numeric values, and the number under the cursor can be retrieved by
 $w find withtag current
(as the ''current'' tag goes temporarily to the item under the cursor). A more robust way, not depending on canvas object creation order, might be
 $w itemcget current -text
which of course returns the displayed string of a text item (and throws an error on others).

[HJG] Ok, that helps me another step forward. 
But now I have trouble checking the existance of a variable - see above, proc click
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[Category Toys]