diff --git a/pharo-mooc/redo/.project b/pharo-mooc/redo/.project
new file mode 100644
index 0000000..81083cc
--- /dev/null
+++ b/pharo-mooc/redo/.project
@@ -0,0 +1,3 @@
+{
+	'srcDirectory' : 'src'
+}
\ No newline at end of file
diff --git a/pharo-mooc/redo/src/.properties b/pharo-mooc/redo/src/.properties
new file mode 100644
index 0000000..ad0471d
--- /dev/null
+++ b/pharo-mooc/redo/src/.properties
@@ -0,0 +1,3 @@
+{
+	#format : #tonel
+}
\ No newline at end of file
diff --git a/pharo-mooc/redo/src/Dice/Die.class.st b/pharo-mooc/redo/src/Dice/Die.class.st
new file mode 100644
index 0000000..07b844a
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/Die.class.st
@@ -0,0 +1,47 @@
+Class {
+	#name : #Die,
+	#superclass : #Object,
+	#instVars : [
+		'faces'
+	],
+	#category : #Dice
+}
+
+{ #category : #'instance creation' }
+Die class >> withFaces: anInteger [ 
+
+	| d |
+	d := Die new.
+	d faces: anInteger.
+	^ d
+]
+
+{ #category : #accessing }
+Die >> faces [
+	^ faces
+]
+
+{ #category : #accessing }
+Die >> faces: anInteger [ 
+	faces := anInteger
+]
+
+{ #category : #initialization }
+Die >> initialize [
+
+	super initialize.
+	faces := 6
+]
+
+{ #category : #initialization }
+Die >> printOn: aStream [
+
+	super printOn: aStream.
+	aStream nextPutAll: ' (', faces printString, ')'
+]
+
+{ #category : #accessing }
+Die >> roll [
+
+	^ faces atRandom
+]
diff --git a/pharo-mooc/redo/src/Dice/DieHandle.class.st b/pharo-mooc/redo/src/Dice/DieHandle.class.st
new file mode 100644
index 0000000..6820367
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/DieHandle.class.st
@@ -0,0 +1,61 @@
+Class {
+	#name : #DieHandle,
+	#superclass : #Object,
+	#instVars : [
+		'dice'
+	],
+	#category : #Dice
+}
+
+{ #category : #initialization }
+DieHandle >> + aDieHandle [
+
+	| handle |
+	handle := self class new.
+	self dice do: [ :each | handle addDie: each ].
+	aDieHandle dice do: [ :each | handle addDie: each ].
+	^ handle
+]
+
+{ #category : #initialization }
+DieHandle >> addDie: aDie [
+
+	dice add: aDie
+]
+
+{ #category : #initialization }
+DieHandle >> dice [
+
+	^ dice
+]
+
+{ #category : #initialization }
+DieHandle >> diceNumber [
+
+	^ dice size
+]
+
+{ #category : #initialization }
+DieHandle >> initialize [ 
+
+	super initialize.
+	dice := OrderedCollection new. 
+]
+
+{ #category : #accessing }
+DieHandle >> maxValue [
+
+	| res |
+	res := 0.
+	dice do: [ :each | res := res + each faces ].
+	^ res
+]
+
+{ #category : #accessing }
+DieHandle >> roll [
+
+	| res |
+	res := 0.
+	dice do: [ :each | res := res + each roll ].
+	^ res
+]
diff --git a/pharo-mooc/redo/src/Dice/DieHandleTest.class.st b/pharo-mooc/redo/src/Dice/DieHandleTest.class.st
new file mode 100644
index 0000000..ac6bc55
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/DieHandleTest.class.st
@@ -0,0 +1,61 @@
+Class {
+	#name : #DieHandleTest,
+	#superclass : #TestCase,
+	#category : #Dice
+}
+
+{ #category : #tests }
+DieHandleTest >> testCreationAndAdding [
+
+	| handle |
+	handle := DieHandle new
+		addDie: (Die withFaces: 6);
+		addDie: (Die withFaces: 10);
+		yourself.
+	self assert: handle diceNumber equals: 2
+]
+
+{ #category : #tests }
+DieHandleTest >> testCreationWithTheSameDice [
+
+	| handle |
+	handle := DieHandle new addDie: (Die withFaces: 6).
+	self assert: handle diceNumber equals: 1.
+	handle addDie: (Die withFaces: 6).
+	self assert: handle diceNumber equals: 2.
+]
+
+{ #category : #tests }
+DieHandleTest >> testMaxValue [
+
+	| handle |
+	handle := DieHandle new
+		addDie: (Die withFaces: 6);
+		addDie: (Die withFaces: 10);
+		yourself.
+	self assert: handle maxValue equals: 16
+]
+
+{ #category : #tests }
+DieHandleTest >> testRoll [
+
+	| handle |
+	handle := DieHandle new
+		addDie: (Die withFaces: 6);
+		addDie: (Die withFaces: 10);
+		yourself.
+	10 timesRepeat:
+		[ self assert: (handle roll between: handle diceNumber and: handle maxValue) ]
+]
+
+{ #category : #tests }
+DieHandleTest >> testSimpleHandle [
+
+	self assert: 2 D20 equals: 2
+]
+
+{ #category : #tests }
+DieHandleTest >> testSumming [
+
+	self assert: (3 D4 + 2 D6) diceNumber equals: 5
+]
diff --git a/pharo-mooc/redo/src/Dice/DieTest.class.st b/pharo-mooc/redo/src/Dice/DieTest.class.st
new file mode 100644
index 0000000..f62b2af
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/DieTest.class.st
@@ -0,0 +1,30 @@
+Class {
+	#name : #DieTest,
+	#superclass : #TestCase,
+	#category : #Dice
+}
+
+{ #category : #tests }
+DieTest >> testCreationIsOk [
+
+	| d |
+	d := Die withFaces: 20.
+	self assert: d faces equals: 20
+]
+
+{ #category : #tests }
+DieTest >> testInitializationIsOk [
+
+	| d |
+	d := Die new.
+	self assert: d faces equals: 6
+]
+
+{ #category : #tests }
+DieTest >> testRolling [
+
+	| d |
+	d := Die new.
+	10 timesRepeat:
+		[ self assert: (d roll between: 1 and: 6) ]
+]
diff --git a/pharo-mooc/redo/src/Dice/Integer.extension.st b/pharo-mooc/redo/src/Dice/Integer.extension.st
new file mode 100644
index 0000000..f97a827
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/Integer.extension.st
@@ -0,0 +1,28 @@
+Extension { #name : #Integer }
+
+{ #category : #'*Dice' }
+Integer >> D20 [
+
+	self D: 20
+]
+
+{ #category : #'*Dice' }
+Integer >> D4 [
+
+	^ self D: 4
+]
+
+{ #category : #'*Dice' }
+Integer >> D6 [
+
+	^ self D: 6
+]
+
+{ #category : #'*Dice' }
+Integer >> D: anInteger [
+
+	| handle |
+	handle := DieHandle new.
+	self timesRepeat: [ handle addDie: (Die withFaces: anInteger) ].
+	^ handle
+]
diff --git a/pharo-mooc/redo/src/Dice/package.st b/pharo-mooc/redo/src/Dice/package.st
new file mode 100644
index 0000000..30779b6
--- /dev/null
+++ b/pharo-mooc/redo/src/Dice/package.st
@@ -0,0 +1 @@
+Package { #name : #Dice }
diff --git a/pharo-mooc/redo/src/MyCounter/Counter.class.st b/pharo-mooc/redo/src/MyCounter/Counter.class.st
new file mode 100644
index 0000000..2d65fa1
--- /dev/null
+++ b/pharo-mooc/redo/src/MyCounter/Counter.class.st
@@ -0,0 +1,60 @@
+"
+Counter is a simple concrete class which supports incrementing and
+decrementing a counter.
+
+Its API is
+- decrement, increment
+- count
+Its creation API is message startingAt:
+"
+Class {
+	#name : #Counter,
+	#superclass : #Object,
+	#instVars : [
+		'count'
+	],
+	#category : #MyCounter
+}
+
+{ #category : #accessing }
+Counter class >> startingAt: anInteger [
+	^ self new count: anInteger
+]
+
+{ #category : #accessing }
+Counter >> count [
+
+	^ count
+]
+
+{ #category : #accessing }
+Counter >> count: anInteger [
+
+	count := anInteger
+]
+
+{ #category : #operation }
+Counter >> decrement [
+
+	count := count - 1
+]
+
+{ #category : #operation }
+Counter >> increment [
+
+	count := count + 1
+]
+
+{ #category : #initialization }
+Counter >> initialize [
+   super initialize.
+	count := 0
+]
+
+{ #category : #accessing }
+Counter >> printOn: aStream [
+
+	super printOn: aStream. "a Counter"
+	aStream nextPutAll: ' withValue: ', count printString.
+	aStream cr
+]
diff --git a/pharo-mooc/redo/src/MyCounter/CounterTest.class.st b/pharo-mooc/redo/src/MyCounter/CounterTest.class.st
new file mode 100644
index 0000000..ba2afe5
--- /dev/null
+++ b/pharo-mooc/redo/src/MyCounter/CounterTest.class.st
@@ -0,0 +1,55 @@
+Class {
+	#name : #CounterTest,
+	#superclass : #TestCase,
+	#category : #MyCounter
+}
+
+{ #category : #tests }
+CounterTest >> testCountIsSetAndRead [
+	| c |
+	c := Counter new.
+	c count: 7.
+	self assert: c count equals: 7
+]
+
+{ #category : #tests }
+CounterTest >> testCounterWellInitialized [
+	self assert: (Counter new increment; increment; count) equals: 2
+]
+
+{ #category : #tests }
+CounterTest >> testDecrement [
+	| c |
+	c := Counter new.
+	c count: 2.
+	c decrement; decrement.
+	self assert: c count equals: 0
+]
+
+{ #category : #tests }
+CounterTest >> testIncrement [
+	| c |
+	c := Counter new.
+	c count: 2.
+	c increment; increment.
+	self assert: c count equals: 4
+]
+
+{ #category : #tests }
+CounterTest >> testInizialize [
+	self assert: Counter new count equals: 0
+]
+
+{ #category : #tests }
+CounterTest >> testStartingAt5 [
+	| c |
+	c := Counter startingAt: 5.
+	self assert: c count equals: 5
+]
+
+{ #category : #tests }
+CounterTest >> testStartingAt5Increment [
+	| c |
+	c := Counter startingAt: 5.
+	self assert: (c increment; count) equals: 6
+]
diff --git a/pharo-mooc/redo/src/MyCounter/package.st b/pharo-mooc/redo/src/MyCounter/package.st
new file mode 100644
index 0000000..242e6c9
--- /dev/null
+++ b/pharo-mooc/redo/src/MyCounter/package.st
@@ -0,0 +1 @@
+Package { #name : #MyCounter }