S4 E1: Fifteen's Minute of Fame

S4 E2: On Your Head

S4 E3: Ten's Place

S4 E4: Balancing Bridge

S4 E5: Sixteen

S4 E6: Square Club

S4 E7: Seventeen

S4 E8: Eighteen

S4 E9: Loop the Loop

S4 E10: Nineteen

S4 E11: Twenty

S4 E12: Tall Stories

S4 E13: Flights of Fancy

S4 E14: I Can Count to Twenty

S4 E15: Heist

S4 E16: Sign of the Times

S4 E17: Fun Times Fair

S4 E18: The Lair of Shares

S4 E19: Terrible Twosday

S4 E20: Divide and Drive

S4 E21: Twenty One and On

S4 E22: We're Going on a Square Hunt

S4 E23: Thirty's Big Top

S4 E24: Land of the Giants

S4 E25: Fifty

S4 E26: Sixty's High Score

S4 E27: The Big One

S4 E28: One Hundred

S4 E29: One Thousand and One

S4 E30: More to Explore