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
2200.11Positive Integer Solutions: Count Them
2260.11Huge Difference of Squares
2288.11A Symmetric Equation
2440.63Rashon and Santiago
2710.11Sum of Digits
2761.12Collinear Vertices of Squares
2761.13A Tantalizing Trapezoid
3155.61Triangle Cleverness
3340.12Trapezoid Angle Measure
3420.51Area of a Regular Pentagon
3680.31Finding a Slope
4040.11When Does sin(x) = x/100?
4050.11Angles in a Special Triangle
4050.14From Tangent to Sine
4100.11Compound Fraction: Trig
4100.12There's A Cosine In It
4100.21Find a Sine
4100.22Cosine of Three
4100.41That's Impossible!
4120.11Insulating Tape
4140.11Find the Circumference
4200.11Tetrahedron Cutoffs
4200.21A New Volcano
4200.23The Yacht Gemini on the Hudson
4200.24Rocket Launch
4200.25Sighting an Airplane
4200.27The Top of the Turbine