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
1007.22Continuous Line Drawing
1090.61A Pile of Cubes
1090.75Fly on the Cube
1090.91The Pierced Cube
1095.12The Checker-Boarded Face
1180.44Social Scale of Boojums
1230.42Who is Going with Whom?
1230.53Who is in Which Family?
1230.64Card Nonsense
1330.11Square Mistake!
1331.11Guess My Age!
1340.52Pocket Change
1470.54A Million Drops of Water
1540.71Stella's Barbecue
1540.72Waterbed Weight
1550.39Trading Cards
2070.14Ghanaian Shirts
2070.23Babysitting Rates
2150.62Lowest Terms?
2150.81A Horrendous Quantity
2200.61Holstein or Guernsey?
2230.32A Quadratic Question
2230.41Find the Smallest Root
2260.31Outrageous Cube Root
2702.11Add'Em Up
2764.11Stella's Fishpond II
2860.11Integer Sum of Unknown Length!
3321.11A Circle and A Square
3360.11Mystery Trapezoid
3550.51A Wheel Within A Wheel
3560.11Intersecting Chords
3750.72Subsistence Allowance
4100.12There's A Cosine In It
4200.27The Top of the Turbine
4400.11Knowing the Shot