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
1009.11Triangle Count
1070.21Grandfather Clock Strikes
1070.43Park Run
1110.44Ten Billiard Balls
1230.22Train Crew
1334.11Square and Cube
1550.38Bananas and Pears
1550.41Cows and Oxen
2050.44Parentheses Insert
2100.32Sums of Odd Numbers
2110.11Big Product
2140.31Gear Wheels
2250.21Strange Equation
2410.21Tennis Team
2440.14Trains DC-NYC
2440.17Maggie and Aggie
2440.51Race to the Bus
2440.71Uther and Eethyl
2465.99The Rope
2590.12Function Graphs
2740.38Find k (logarithms)
2860.41Fraction Pattern
2860.51Robot Stones
2860.61Arithmetic Sequence I
3060.52Red and Blue Point Triangle
3310.19A Pentangle
3360.22City Hall Tile Floor
3405.11Seven Rectangles
3405.31Pumpkin Patch
3410.32Squares Make An Octagon
3420.81Intersecting Medians
3580.14Akashi-Kaikyo Bridge
3590.11Parallelogram and a Geometric Mean
3650.23Big Rectangular Solid
4120.11Insulating Tape