Here's a basic chart showing what's where in this long list of problems. There are two fully detailed lists in the User Guide:  SDS Topics in Alphabetical Order and SDS Topics in Numerical Order.

TopicStella Number
Visual Problems1000 – 1170
Logical Deduction1180 – 1290, 3750
Arithmetic1300 – 2022
Symbol Manipulation2030 – 2390, 2745, 4100
Algebra Problems2400 – 2500
Analytic Geometry2750 – 2840, 3680 – 3723
Informal Geometry3000 – 3080
Euclidean Geometry3100 – 3650, 3750 – 3850
Trigonometry4000 – 4340
Probability4400 – 4420

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Stella NumberProblem Title
1000.15Telling Time Backwards, Part I
1000.21Floor Tile Reflection no. 1
1000.81Continue the Pattern
1000.91Chessboard Dominoes
1007.11The Impossible Path
1009.31Counting Squares
1020.12Covered Shapes
1020.42Overlapping Squares
1020.51Manhole Covers
1027.11Partition This Shape no. 1
1027.14Partition This Shape no. 4
1027.15Partition This Shape no. 5
1040.11Ten Peach Trees
1070.19Watson's Purchase
1070.21Grandfather Clock Strikes
1090.21Labeled Cube Views
1090.42Six Toothpicks
1090.71Twenty-Seven Little Cubes
1090.73Cutting a White Pine
1090.74How Big is This Cube?
1090.75Fly on the Cube
1100.51Agatha the Cow
1100.71Martha the Grocer and her Two-Pan Scale
1110.61Security Guards
1130.11A Magic Square with Primes
1180.37Dogs, Cats, Snakes
1180.43Gleepers & Blahmies
1230.44Glenda Aces a Quiz
1230.53Who is in Which Family?
1230.63Maurice’s Video Games
1240.11A Fox, a Goose, and a Bag of Corn
1250.11False Coin no. 1
1250.12False Coin no. 2
1250.13False Coins no. 3
1260.21Handshakes; Fly on the Wall
1290.14Gym Class
1310.25Super Venn Diagram
1331.14Difference of Squares
1332.11Whole Number Radicals
1370.21Dust Mites
1510.42Farmer Fox
1550.22In A Dream
1550.24Sibyl Bibble
1550.25Tree and Nests
1550.27Mr. Adams's Will
1550.39Trading Cards
1550.43A Horse and a Mule Converse
1650.31Divisibility Theorem (Sum)
1720.41Patterned Equations
1730.41Need More Money?
2070.22Alyssa's Formula
2100.12Who's The Champion?
2100.33Sum of Odd Numbers
2100.52Rational Expressions, Laws of Exponents
2110.12Giant Distribution
2150.21Reciprocal Symmetry
2150.41Adding x to Numerator and Denominator
2150.62Lowest Terms?
2162.11An Infinite Continued Fraction
2200.61Holstein or Guernsey?
2210.71Point on a Line. Making a Triangle?
2230.51Jessamine Bush
2260.21A Fourth Degree Equation
2290.11The Dutch Miller
2410.21Tennis Team
2420.41The Cow, the Goat, and the Wildebeest
2440.11Beef's Lost Loot
2440.13Driving to Nirvana
2440.14Trains DC-NYC
2440.31Columbus to Cincinnati
2440.33Susu the Cat
2440.41York to London
2440.51Race to the Bus
2440.70Snow Tires Versus Ordinary Tires
2442.52Daniel Boone on Plum Creek
2452.13Fifty Mycologists
2500.21Finding Sides of a Triangle
2500.31Foxes and Owls
2500.63Kumquat House Numbers
2510.11Defined Operation no. 1
2510.21Defined Operation no. 2
2530.52Defined Operation 4; Do Composition
2850.65A Sequence by Subtraction
2870.11Levy's Basketball
3050.12Bugs on a Branch
3060.51Red and Blue Point Line Segment
3065.11Red/Blue Tubular Neon Lights
3070.11Algebra with Angles
3070.12A Supplement/Complement Conjecture
3150.11Calculating an Angle
3155.22A Triangular Garden
3155.41A Mystery Angle
3160.11Triangle ABC is Isosceles
3261.11Quadrilateral BCDF is a Rhombus
3305.51Making a Regular Octagon
3305.52Stop Sign
3320.21A Square Inside a Circle Inside a Square
3321.11A Circle and A Square
3350.11Overlapping Parallelograms
3360.11Mystery Trapezoid
3405.12Impossible Rectangle?
3420.22The Area of a Cross
3420.25The Sum of Two Triangles
3420.29Midline Triangle
3420.41Dance of the Area Bisectors
3420.73Crazy Baseball Diamond
3440.12Billy the Goat
3440.13A Girl and Her Dog
3440.31A Lovely Circular Lawn
3440.51Fraction of a Circular Area
3470.14Square with Internal Segments
3470.32Cardboard Box
3475.11The Unknown Edge
3550.21Clock with Revolutionary Bug
3580.14Akashi-Kaikyo Bridge
3590.11Parallelogram and a Geometric Mean
3650.14Tennis Balls
3650.21Two Barrels
3650.31Volume and Surface Area of a Cube
3695.11A Square in a Cube
3750.21Negating Barbells
3750.41Find the Falsehoods
3750.61Pickled Walnuts
3750.74Toxic Tangles
3850.14Where Are The Crumbs?