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
1010.11Squares in a Square
1020.15A Triangle with Given Midpoints
1020.23Vacation on a Triangular Island
1020.42Overlapping Squares
1020.44Dividing the Yin and the Yang
2070.43Big and Little Cubes
2210.41Distance on the Number Line
2760.21Adjacent Corner of a Square
2761.11A Sum of Slopes
3070.12A Supplement/Complement Conjecture
3150.11Calculating an Angle
3155.21Jasmine and Biscuit
3155.22A Triangular Garden
3155.41A Mystery Angle
3155.51A Narrow Sinister Alley
3160.11Triangle ABC is Isosceles
3261.11Quadrilateral BCDF is a Rhombus
3305.11Diagonals of Two Regular Polygons
3305.52Stop Sign
3310.11Sum of Interior Angles
3310.19A Pentangle
3320.11A Ratio of Areas
3320.21A Square Inside a Circle Inside a Square
3350.11Overlapping Parallelograms
3360.11Mystery Trapezoid
3410.32Squares Make An Octagon
3420.22The Area of a Cross
3420.24Three Equilateral Triangles
3420.25The Sum of Two Triangles
3420.26Area of a Hexagon
3420.27Triangle Area
3420.29Midline Triangle
3420.41Dance of the Area Bisectors
3420.43Regular Triangle, Regular Hexagon
3420.61Two Triangles and a Square
3420.71Hard Triangle Area
3420.73Crazy Baseball Diamond
3420.81Intersecting Medians
3440.12Billy the Goat
3440.13A Girl and Her Dog
3440.31A Lovely Circular Lawn
3440.41First: Trisect the Diameter
3440.43Fencing Inside a Circular Field
3440.51Fraction of a Circular Area
3450.21Tetrahedron Inscribed in a Cube
3470.12Radio Antenna
3470.14Square with Internal Segments
3470.21Distance in flight
3470.32Cardboard Box
3470.51A Triangle in a Circle
3470.61Barber Pole
3500.21Midpoint of a Chord?
3500.31Circle Around Three Squares
3500.41Water Pipes Stack
3500.51Gertrude the Goldfish
3500.61Three Circular Disks
3500.63Four Tangent Circles
3510.13Is It a Parallelogram?
3550.11LP Phonograph Record
3550.23Our Whirling, Twirling, Swirling World
3550.24Put Your Hands Together
3550.44Walking the Equator
3550.51A Wheel Within A Wheel
3560.11Intersecting Chords
3580.13Two Equilateral Triangles
3580.14Akashi-Kaikyo Bridge
3580.15Estimating Height
3580.17Similarity Exercise
3580.21All Angles
3590.11Parallelogram and a Geometric Mean
3640.11Basketball in a Box
3650.11Peanut Butter Pricing
3650.14Tennis Balls
3650.15Pouring Water
3650.23Big Rectangular Solid
3650.41Pouring Between Glasses
3650.51Box in a Hat
3650.61Triangular Pyramid
3680.31Finding a Slope
3695.11A Square in a Cube
3850.11Rhombi, Locus of Vertex
4050.12Area External to Two Circles
4220.11View to the Horizon