diff --git a/31_Depth_Charge/ruby/.gitignore b/31_Depth_Charge/ruby/.gitignore
new file mode 100644
index 00000000..d25ad7bc
--- /dev/null
+++ b/31_Depth_Charge/ruby/.gitignore
@@ -0,0 +1,57 @@
+# Package Shell Specific Things
+
+## Build Process
+
+/build
+
+## Transient files
+
+/src/input
+/src/output
+/src/log
+/drop
+
+# Programming Languages
+
+## Java
+/src/java/**/*.class
+
+## Rakudo / Perl6
+/src/**/.precomp
+
+## PHP
+/vendor/
+
+## Python
+*.swp
+__pycache__/
+*.pyc
+*.egg-info
+/dist
+
+## Ruby
+*.gem
+.bundle
+
+# Editors
+
+## Dia
+*.dia.autosave
+
+## Emacs
+\#*\#
+.\#*
+
+
+## Vi / Vim
+*.swp
+
+# Filesystem Artifacts
+
+## Mac
+
+.DS_Store
+
+## NFS
+
+.nfs*
diff --git a/31_Depth_Charge/ruby/depthcharge.rb b/31_Depth_Charge/ruby/depthcharge.rb
index 5ba36ba6..ba2a5d83 100755
--- a/31_Depth_Charge/ruby/depthcharge.rb
+++ b/31_Depth_Charge/ruby/depthcharge.rb
@@ -13,7 +13,6 @@ class DepthCharge
       break if ! get_input_another_game()
     end
 
-    # 420 PRINT "OK.  HOPE YOU ENJOYED YOURSELF." : GOTO 600
     printf("OK.  HOPE YOU ENJOYED YOURSELF.\n")
   end
 
@@ -51,7 +50,7 @@ class DepthCharge
 
       the_input = Integer(value) rescue nil
 
-      if the_input == nil || the_input < 0
+      if the_input == nil || the_input < 1
         printf("PLEASE ENTER A POSITIVE NUMBER\n\n")
         next
 
@@ -61,25 +60,7 @@ class DepthCharge
     end
   end
 
-  def get_search_area_dimension
-    # 20 INPUT "DIMENSION OF SEARCH AREA";G: PRINT
-    @search_area_dimension = get_input_positive_integer("DIMENSION OF SEARCH AREA: ")
-    # 30 N=INT(LOG(G)/LOG(2))+1
-
-    @num_tries = Integer(
-      Math.log(@search_area_dimension)/Math.log(2)
-    )
-
-  end
-
   def print_instructions
-    # 40 PRINT "YOU ARE THE CAPTAIN OF THE DESTROYER USS COMPUTER"
-    # 50 PRINT "AN ENEMY SUB HAS BEEN CAUSING YOU TROUBLE.  YOUR"
-    # 60 PRINT "MISSION IS TO DESTROY IT.  YOU HAVE";N;"SHOTS."
-    # 70 PRINT "SPECIFY DEPTH CHARGE EXPLOSION POINT WITH A"
-    # 80 PRINT "TRIO OF NUMBERS -- THE FIRST TWO ARE THE"
-    # 90 PRINT "SURFACE COORDINATES; THE THIRD IS THE DEPTH."
-    # 100 PRINT : PRINT "GOOD LUCK !": PRINT
     printf( <<~INSTRUCTIONS
 YOU ARE THE CAPTAIN OF THE DESTROYER USS COMPUTER
 AN ENEMY SUB HAS BEEN CAUSING YOU TROUBLE.  YOUR
@@ -110,19 +91,21 @@ GOOD LUCK !
   end
 
   def setup_game
-    get_search_area_dimension()
+    @search_area_dimension = get_input_positive_integer("DIMENSION OF SEARCH AREA: ")
+
+    @num_tries = Integer(
+      Math.log(@search_area_dimension)/Math.log(2) + 1
+    )
     setup_enemy()
   end
 
   def setup_enemy
-    # 110 A=INT(G*RND(1)) : B=INT(G*RND(1)) : C=INT(G*RND(1))
     @enemy_x = rand(1..@search_area_dimension)
     @enemy_y = rand(1..@search_area_dimension)
     @enemy_z = rand(1..@search_area_dimension)
-    end
+  end
 
   def game_loop
-    # 120 FOR D=1 TO N : PRINT : PRINT "TRIAL #";D; : INPUT X,Y,Z
     for @trial in 1..@num_tries do
       output_game_status()
 
@@ -130,7 +113,6 @@ GOOD LUCK !
       @shot_y = get_input_positive_integer("Y: ")
       @shot_z = get_input_positive_integer("Z: ")
 
-      # 130 IF ABS(X-A)+ABS(Y-B)+ABS(Z-C)=0 THEN 300
       if (
         (@enemy_x - @shot_x).abs \
         + (@enemy_y - @shot_y).abs \
@@ -140,7 +122,6 @@ GOOD LUCK !
         you_win()
         return
       else
-        # 140 GOSUB 500 : PRINT : NEXT D
         missed_shot()
       end
     end
@@ -156,54 +137,41 @@ GOOD LUCK !
     printf("TRIAL \#%d\n", @trial)
   end
   def you_win
-    printf("B O O M ! ! YOU FOUND IT IN %d TRIES!\n\n", @trial )
+    printf("\nB O O M ! ! YOU FOUND IT IN %d TRIES!\n\n", @trial )
   end
   def missed_shot
     missed_directions = []
 
-    # 530 IF X>A THEN PRINT "EAST";
-    # 540 IF X<A THEN PRINT "WEST";
     if @shot_x > @enemy_x
       missed_directions.push('TOO FAR EAST')
     elsif @shot_x < @enemy_x
       missed_directions.push('TOO FAR WEST')
     end
 
-    # 510 IF Y>B THEN PRINT "NORTH";
-    # 520 IF Y<B THEN PRINT "SOUTH";
     if @shot_y > @enemy_y
       missed_directions.push('TOO FAR NORTH')
     elsif @shot_y < @enemy_y
       missed_directions.push('TOO FAR SOUTH')
     end
 
-    # 560 IF Z>C THEN PRINT " TOO LOW."
-    # 570 IF Z<C THEN PRINT " TOO HIGH."
-    # 580 IF Z=C THEN PRINT " DEPTH OK."
     if @shot_z > @enemy_z
       missed_directions.push('TOO DEEP')
     elsif @shot_z < @enemy_z
       missed_directions.push('TOO SHALLOW')
     end
 
-    # 500 PRINT "SONAR REPORTS SHOT WAS ";
     printf("SONAR REPORTS SHOT WAS: \n")
     printf("%s\n", "\t" + missed_directions.join("\n\t"))
-    # 550 IF Y<>B OR X<>A THEN PRINT " AND";
-    # 590 RETURN
   end
 
   def you_lose
-    # You took too long!
     printf("YOU HAVE BEEN TORPEDOED!  ABANDON SHIP!\n")
     printf("THE SUBMARINE WAS AT %d %d %d\n", @enemy_x, @enemy_y, @enemy_z)
 
   end
 
   def get_input_another_game
-    # 400 PRINT : PRINT: INPUT "ANOTHER GAME (Y OR N)";A$
     return get_input_y_or_n("ANOTHER GAME (Y OR N): ")
-    # 410 IF A$="Y" THEN 100
   end
 end