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
1000.53Stella's Fishpond
1007.11The Impossible Path
1007.21Trace This Network
1010.41Sequences of Squares
1010.42More Sequences of Squares
1070.31You'll Never Guess
1100.22Continue a Numerical Pattern
1160.32Multiplication Puzzle
1230.51Playing Cards to Identify
1230.61Amy, Brenda, Christa, Dana
1230.63Maurice’s Video Games
1230.71Chemical Conundrum
1370.11Gain Versus Loss
1370.21Dust Mites
1480.41Broken $\surd$ Key
1610.31Nasty Numbers
1640.31Ballpoint Pen Sale
1730.41Need More Money?
2070.82Mystery Function
2070.84Particle Motion
2260.41Two Cubes
2410.12Spend or Save?
2410.33Battling Percentages
2410.34Wendy the Chemist
2500.41Milly and Molly Make Muffins. So Do Their Mothers!
2660.11Imaginary Roots
2710.11Sum of Digits
3420.41Dance of the Area Bisectors
3420.71Hard Triangle Area
3470.14Square with Internal Segments
3550.44Walking the Equator
3650.11Peanut Butter Pricing
4050.12Area External to Two Circles
4200.23The Yacht Gemini on the Hudson