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
1020.12Covered Shapes
1027.44Congruent Gardens
1050.11Penny Triangle
1050.61The Rolling Penny
1060.41Moving Toothpicks
1120.11Crossnumber Puzzle no. 1
1180.61Mathies and Websters
1230.34Super-Duper Market
1230.36Tennis-Playing Family
1290.14Gym Class
1300.11Mystery Number
1368.21Torture with Fractions
1368.25Egyptian Fractions Intro
1470.51Heartbeats per Month
1550.14Toy Rocket
1550.19Wrestlers on the Scale
1550.25Tree and Nests
2150.11Difference of Reciprocals
2152.22Catch a Robber and Maximize Your Reward
2180.11Real-valued Radical
2210.32Fractional Inequality
2210.41Distance on the Number Line
2310.11Fleet Street Market
2420.11Hen and a Half
2454.11How Mean?
2470.52Teapot Trade
2500.31Foxes and Owls
2510.21Defined Operation no. 2
2580.11Big f(x), Find f(6)
3050.12Bugs on a Branch
3420.28Shaded Square Area
3470.61Barber Pole
3750.21Negating Barbells
4040.11When Does sin(x) = x/100?