docs(course): fix review findings in modules 00–05

Co-Authored-By: Claude Opus 5.5 <[email protected]>

course/04-randomness-without-side-effects.md

@@ -541,6 +541,20 @@ It is "the value of `nextUint32`, transformed". Which of your new functions tran
 
 </details>
 
+<details><summary>Exercise 4.3 (intBelow) — near-solution (try the others first)</summary>
+
+```js
+export const intBelow = (n) => map(___, (v) => ___)
+```
+```scala
+def intBelow(n: Int): Random[Int] = nextUint32.map(v => ___)
+```
+```fsharp
+let intBelow (n: int) : Random<int> = nextUint32 |> map (fun v -> ___)
+```
+
+</details>
+
 <details><summary>Exercise 4.4 (freeCells) — nudge</summary>
 
 First build *all* cells in row-major order, then keep those not in the snake.
@@ -615,6 +629,23 @@ Each is one line: a function applied to the result of another.
 
 </details>
 
+<details><summary>Exercise 4.6 (tick, newGame) — near-solution (try the others first)</summary>
+
+```js
+export const tick = (state) => spawnApple(___(state))
+export const newGame = (seed) => ___(initialState(___))
+```
+```scala
+def tick(state: GameState): GameState = spawnApple(___)
+def newGame(seed: Long): GameState = ___(Model.initialState(___))
+```
+```fsharp
+let tick (state: GameState) : GameState = state |> Rules.advance |> ___
+let newGame (seed: uint32) : GameState = seed |> ___ |> ___
+```
+
+</details>
+
 ## Check your understanding
 
 1. Why is `const roll = () => Math.floor(Math.random() * 6)` impure, while `d6 = map(nextUint32, v => 1 + v % 6)` is pure? Where did the "randomness" go?