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
1070.13The Snail in the Well
1070.15Pirate Queen Harriet
1090.21Labeled Cube Views
1090.22Cube Frames
1090.24Looped Rings
1090.25Bohemian Chain Mail
1090.73Cutting a White Pine
1170.92A Ton of Pennies
1180.22Horse Trading
1180.36Restaurant Staff Puzzle
1232.11Soccer Scores
1250.13False Coins no. 3
1280.12Highland Island
1490.16Buying Sand
1490.31Tie-Dyed T-Shirts
1510.11Heap: An Egyptian Equation
1540.33Hattie's Age in 1900
1550.16Harnessing Horses
2020.11Expand That Binomial!
2050.22Four 4’s: 21 – 40
2070.51Square of Dates
2150.41Adding x to Numerator and Denominator
2250.11A Nice Rational Equation
2420.31Watering Your Venus Flytrap
2440.31Columbus to Cincinnati
2480.11A Birthday Present in Dimes and Quarters
2530.41Composition with a Defined Operation
2580.41A Seventh Power Equation
2761.11A Sum of Slopes
3150.11Calculating an Angle
3460.11Split That Triangle!
3650.41Pouring Between Glasses
4050.11Angles in a Special Triangle